Pain's Tower (Earth-2356)

Pain's Tower is the tallest tower in Skope, the capital city of Ame, and Pain and Konan's base of operations. It has four humanoid faces at each side and is connected to two smaller towers. The tongue of the face that Pain sat on, looking out over the city, had Rinnegan-like eye patterns and is depicted with a pipe and had piercings much like his own and Konan's, with its tongue stuck out.

Somewhere inside there was a chamber hidden behind a solid wall where the Six Paths of Pain's bodies were stored when not in use. At the base of the tower, members of Pain's forces delivered bodies. Its height allowed Nagato to transmit Force signals to the Paths regardless of their position in the city.

The tower also housed a morgue, which enabled Nagato to easily replace his Paths in the event a body was rendered unusable.

Source

 * https://naruto.fandom.com/wiki/Pain's_Tower.