San Diego Architectural Foundation

This swimming pool in the Spree River was originally a temporary art installation, but the locals loved it so much it became a permanent feature.

The sunken hull of a cargo ship is transformed into a pristine pool. Resting almost level with the surface of the river, it provides the sensation of swimming in the river itself with the city skyline as a dramatic backdrop.

Open late at night and complete with a bar area and sauna, it is even open in the middle of winter, although covered with a curving translucent shelter. This oasis in the city enlivens life along the previously neglected banks of the river.