Arena Badeschiff

Berlin's funkiest bathing destination is the hull of a container ship in the Spree River with an open-air bar and beach area next to it. It pays homage to the time when Berlin had 15 such bathing facilities along the river at the turn of the 20th century. Closed in winter, after April it's wide open to 360° views of the river and city. Bring your inflatables if you're not a good swimmer – the 325-square-meter heated pool is over two metres deep. Massages, towels and flip-flops are available.