Iga-Ueno Castle — White Walls & High Stone Ramparts

Iga-Ueno Castle (伊賀上野城) is a reconstructed castle (rebuilt in 1935) famous for having Japan's tallest stone walls — the ramparts reach 30 meters high without mortar, among the highest castle walls in Japan. The walls were engineered by Todo Takatora, a legendary castle architect of the Edo period who designed over 20 castles. The white-walled castle keep (三層, three-story donjon) sits atop the stone ramparts, creating a striking vertical composition visible across Iga City.

The castle interior functions as a museum displaying samurai armor, swords, historical documents, and exhibits on Todo Takatora's castle-building techniques. The top floor provides panoramic views over Iga City and surrounding mountains. The castle grounds feature traditional Japanese gardens, tea houses, and seasonal cherry blossoms (late March–early April) and autumn foliage (November). The castle is smaller and less touristy than Himeji or Osaka castles but architecturally significant due to the engineering achievement of its stone walls.