Hamburg's city and yacht harbour.
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One of the last generation of pre-containerisation cargo ships (built in the 1960s), now semi-permanently moored halfway between Landungsbrücken and the Speicherstadt, and is the largest functional cargo museum ship in the world. The ship has been restored and is maintained in full working order by volunteers (who take it out a few times a year, notably during the Hafengeburtstag celebration). You can visit the ship and walk around most areas, including the crew quarters, cargo compartments, and engine room. The ship also hosts a number of other minor attractions, including an exhibit on emigration and an escape room. The ship also has a few guest rooms for overnight stays.
Germany's only floating church in Rothenburgsort.
New 'architectural lighthouse' of Hamburg. On the top of a huge old warehouse a 110 metres tall modern philharmonic hall with glass façade and wave-shaped roof. It also includes a fancy hotel, restaurant, as well as private apartments. Access to the observation deck (called "Plaza") is free (although you need to get a ticket to prevent overcrowding), and offers a great view of Hamburg. On days of long queues in front of the ticket booth for the Plaza get your ticket at the visitor's centre instead. Normally there are very few people.