Prøvestenen, Copenhagen

Prøvestenen, also known as Benzinøen, is an artificial island off the northeast coast of Amager in Copenhagen, Denmark.

It was created as a marine fortress to guard the entrance to Copenhagen Harbour in the second half of the 18th century and served military purposes until 1922.

The area traces its history back to 1713 when a marine battery was established at the site by wrecking the floating dock Prøvestenen.

In 1723-24 three more ships were wrecked at the site to expand it but it was once again severely damaged by storms and ice and in 1736.

Plans for the large new Copenhagen Marina with room for 1,500 boats was put on hold in 2011.