In the middle of Cologne there is a green oasis by the water where it can get really crowded, especially when the weather is nice: the Aachener Weiher with the adjacent Hiroshima-Nagasaki Park. Although bathing is prohibited in the artificial body of water, the Aachener Weiher with its surrounding meadows regularly attracts numerous visitors, especially students from the nearby university. The Hiroshima-Nagasaki Park was only created after the Second World War when rubble and debris from the destroyed city was piled up here. The name of the park goes back to an initiative of the Cologne Peace Forum in 2000 and is intended to commemorate the first atomic bombs dropped on Hiroshima and Nagasaki.