A UNESCO World Heritage site in the heart of the city, Berlin's Museum Island is a hugely popular attraction both with locals and international tourists.

Dark corridors take you down into the Möller hall with its Ferrodrom science centre and fire-spewing columns, while the viewing platform of the blast furnace requires a lofty ascent.

The Romano-Germanic Museum gives a vivid impression of how Cologne became a city under Roman law and the capital of the imperial province of Lower Germania.

Set between the pedestrian area and the German Maritime Museum, Bremerhaven's historical harbour has a number of museum vessels for visitors to admire.