江戸城 · Edo-jo
The largest castle ever built in Japan — now the Emperor's residence — where you can walk the foundations of the tower that ruled a nation for 265 years.
#21 — 100 Famous CastlesLast entry 16:30
Imperial Palace East Gardens (Higashi-Gyoen) are free. General grounds around the palace moats are always free to walk. The Imperial Palace inner grounds require advance reservation for official tours (free, limited availability).
Edo Castle is an essential Tokyo experience that most visitors overlook in favor of Sensoji or Shibuya. The Imperial Palace East Gardens are completely free, centrally located, and contain genuinely impressive original stone walls, gates, and the magnificent empty tower platform. The scale of the surviving moats — visible from the Nijubashi bridge area — gives a powerful sense of the castle's original dominance over the city. For history enthusiasts, standing on the tenshu-dai and imagining the five-story tower that stood here is a genuinely moving experience.
At its peak under the Tokugawa shogunate, Edo Castle was the largest castle complex in the world by area — its concentric rings of moats, walls, and compounds covered an area larger than the Palace of Versailles. Though the main tower was lost to fire in 1657 and never rebuilt, the surviving stone walls, gates, and moat system are on a scale that staggers the imagination even today.
After the Meiji Restoration in 1868, Emperor Meiji moved his residence from Kyoto to Edo Castle, renaming the city Tokyo (Eastern Capital). Today the inner palace grounds remain the private residence of the Imperial Family — you are walking the grounds of Japan's head of state, on the site of the greatest castle the country ever built.
The Imperial Palace East Gardens (Higashi-Gyoen) occupy the former main compound (Honmaru) and second compound (Ninomaru) — the heart of the original castle. Admission is completely free. Inside, you'll find the great tenshu-dai (main tower stone foundation platform), massive surviving stone walls, original Edo Castle gates, and beautifully maintained Japanese gardens on the ruins of history's greatest feudal castle.
Edo Castle's five-story main tower burned in the Meireki Great Fire of 1657 — a catastrophic blaze that killed over 100,000 people and destroyed much of the city. The Tokugawa shogunate made the deliberate decision not to rebuild the tower: Japan was at peace, military display was less important than economic recovery, and rebuilding the tower would have diverted enormous resources. The empty platform has stood for nearly 370 years.
Visitor Tip
Enter the East Gardens through Otemon Gate (the main historical entrance). Walk directly to the tenshu-dai — the massive stone platform where the main tower once stood. Standing on it and looking out over the compound gives the best sense of the castle's original scale. Then explore the surviving walls, the Hyakunin-bansho guardhouse, and the Ninomaru Garden. The entire East Gardens visit is free.
hirajiro
Flatland castle — built on a low bluff in the Kanto Plain, with extensive water defenses using rivers, canals, and moats
rinkaku
Enclosure style — multiple concentric rings of moats and compounds on an unprecedented scale
Tenshu foundation only — the main tower platform (tenshu-dai) survives as a massive stone base, but the five-story tower that once stood on it burned in the Meireki Great Fire of 1657 and was never rebuilt.
kirikomi_hagi — Fitted stone masonry — precisely cut stones fitted without mortar, the Tokugawa shogunate's signature construction style, producing enormously durable and visually imposing walls
Edo Castle's stone walls are among the finest masonry achievements in Japanese history. The walls of the main compound reach heights of 20 meters or more, built from granite blocks of enormous size transported from quarries in Izu Peninsula. The scale reflects the Tokugawa ambition to build a castle that demonstrated absolute, unchallengeable power.
Edo Castle possessed the most extensive moat system of any castle in history — a spiral arrangement of concentric moats (called the 'rajo' or 'snail-shell' layout) that extended for kilometers around the castle, making the entire city of Edo essentially a castle town integrated with the defensive system. Several moat sections survive today as the Imperial Palace moats.
Spiral Moat Layout (Rajo)
Edo Castle used a unique spiral arrangement of moats — rather than concentric circles, the moats wound outward in a snail-shell pattern, so that an attacking force could never find a direct route to the center. Even after breaching one moat, the next was always at an unexpected angle.
36 Gates
The castle's approach was controlled by 36 masugata (square killing-ground) gate complexes — each forcing attackers into a small enclosed space surrounded by firing positions before the next gate could be opened. Moving an army through the castle's approaches would have taken days under normal conditions.
Enormous Scale as Defense
The castle's sheer size — with rings of defenses extending kilometers from the center — meant that besieging it completely was nearly impossible. Even the massive Tokugawa military force would have struggled to invest the entire perimeter simultaneously.
Tenshu-dai (Tower Platform)
The great stone foundation platform of the original five-story main tower still stands in the East Gardens. Even empty, the platform is an impressive structure — measuring approximately 41 meters wide and 45 meters long, rising 11 meters above the compound floor. It conveys the scale of the tower that once stood here.
The Deadliest Gate in Japan
The attacking force crosses the moat and approaches the outer gate. Defenders hold fire, allowing the enemy to commit.
Historical Context — Edo Castle
No army ever attempted a direct assault on Edo Castle during the Tokugawa period. The castle's defenses were less about withstanding siege and more about making siege unthinkable — the scale, the moat system, and the concentration of Tokugawa power in Edo made any attack suicidal. The castle passed without bloodshed in 1868 when Katsu Kaishu negotiated its peaceful surrender to the Imperial forces — an agreement that saved both the castle and the city.
Ota Dokan, a vassal of the Uesugi clan, constructs the first castle on the site — a modest fortification on a bluff above the marshlands of what was then a minor settlement called Edo.
Tokugawa Ieyasu receives the Kanto region from Toyotomi Hideyoshi and moves his base to Edo Castle. Ieyasu immediately begins massive expansion of the castle and the surrounding town, transforming Edo from a backwater into a major city.
Tokugawa Ieyasu is appointed Shogun by the Emperor, establishing the Tokugawa shogunate with Edo as its seat. The castle becomes the center of government for all of Japan for the next 265 years.
Tokugawa Iemitsu completes the final major construction phase, bringing the castle to its greatest extent — the five-story main tower, the complete moat system, and the full complex of compounds. It is now the largest castle in Japan and arguably the world.
The Meireki Great Fire devastates Edo, killing over 100,000 people. The main castle tower burns and is lost. The Tokugawa shogunate, recognizing that Japan is at peace and the cost of rebuilding is enormous, decides not to reconstruct the tower. The foundation platform stands empty ever after.
The Meiji Restoration ends the Tokugawa shogunate. Katsu Kaishu negotiates the peaceful surrender of Edo Castle to Imperial forces, avoiding the city's destruction. Emperor Meiji moves his residence to the castle, renaming both the castle and the city: Edo Castle becomes the Imperial Palace, Edo becomes Tokyo.
As the seat of the Tokugawa shogunate, Edo Castle appears in virtually every NHK historical drama set in the Edo period. The castle's great hall and garden settings are among the most-recreated sets in Japanese television history.
The 2003 Tom Cruise film depicts the political environment centered on the Meiji imperial court — historically housed at Edo Castle during the period the film depicts.
Spring (late March to early April) for cherry blossoms in Kitanomaru Park adjacent to the castle. Autumn is also beautiful. The East Gardens are pleasant year-round; avoid summer midday heat. Closed Monday and Friday.
1.5-2 hours for East Gardens; add 30 minutes for the Nijubashi / outer moat walk
After the East Gardens, walk around the outer moat to the Nijubashi (Double Bridge) area on the palace's south side — this is the iconic Imperial Palace view with the stone bridge and moat reflection. Then continue to Kitanomaru Park (former north compound, now free park) for a quieter green space with the Budokan arena and science museum. The full circuit of the palace grounds is a rewarding 5-6km walk.
Free Entry
Imperial Palace East Gardens (Higashi-Gyoen) are free. General grounds around the palace moats are always free to walk. The Imperial Palace inner grounds require advance reservation for official tours (free, limited availability).
Imperial Palace East Gardens closed Monday and Friday (except national holidays). Closed December 28–January 3. Hours extend to 18:00 June–August.
川越城 · Kawagoe-jo
📍 Saitama — Kanto
The last honmaru palace in the Kanto region and the castle town that became 'Little Edo' — Kawagoe rewards visitors who want castle life beyond just the tower.
八王子城 · Hachioji-jo
📍 Tokyo — Kanto
Tokyo's forgotten mountain fortress — where thousands died in a single day when Hideyoshi came for the last holdouts of the Hojo clan.
小田原城 · Odawara-jo
📍 Kanagawa — Kanto
The castle that Hideyoshi could not storm — famous less for its tower than for the legendary city-swallowing earthworks and the indecisive council that became a Japanese proverb.
The nearest station is Otemachi Station (Multiple subway lines) or Tokyo Station (JR lines, 10 min walk). It is approximately a 5-minute walk from the station. Parking: Limited public parking near the East Gardens. Train is strongly recommended — Tokyo Station is minutes away. Accessible with a JR Pass.
Edo Castle is free to enter. Imperial Palace East Gardens (Higashi-Gyoen) are free. General grounds around the palace moats are always free to walk. The Imperial Palace inner grounds require advance reservation for official tours (free, limited availability).
Edo Castle is an essential Tokyo experience that most visitors overlook in favor of Sensoji or Shibuya. The Imperial Palace East Gardens are completely free, centrally located, and contain genuinely impressive original stone walls, gates, and the magnificent empty tower platform. The scale of the surviving moats — visible from the Nijubashi bridge area — gives a powerful sense of the castle's original dominance over the city. For history enthusiasts, standing on the tenshu-dai and imagining the five-story tower that stood here is a genuinely moving experience.
Edo Castle is open 09:00 – 17:00 (last entry 16:30). Imperial Palace East Gardens closed Monday and Friday (except national holidays). Closed December 28–January 3. Hours extend to 18:00 June–August.
Plan on spending 1.5-2 hours for East Gardens; add 30 minutes for the Nijubashi / outer moat walk at Edo Castle. After the East Gardens, walk around the outer moat to the Nijubashi (Double Bridge) area on the palace's south side — this is the iconic Imperial Palace view with the stone bridge and moat reflection. Then continue to Kitanomaru Park (former north compound, now free park) for a quieter green space with the Budokan arena and science museum. The full circuit of the palace grounds is a rewarding 5-6km walk.