The massive concrete cathedral of the G-Cans main retaining tank under Tokyo, JapanKeywords: Japan, 日本, Japon, Tokyo, G-cans, 龍Q館, Ryu-Q-Can, 首都圏外郭放水路の龍Q館, concrete, water tank, flood prevention, wall, underground, interior, 地下 | | Nov 13, 2010 86 mm, 10s, f/13 AFS 70-200mm f/2.8 G Location |