Tropical Islands Resort is an artificial tropical resort in Brandenburg, Germany. It is said to be the world's largest tropical indoor pool which can accommodate up to 7,000 visitors a day. It is also the world's largest indoor waterpark at 66,000 m² (710,000 sq feet).
The resort is located in Briesen/Brand, part of Halbe in Dahme-Spreewald, Brandenburg, Germany, about 60 km (36 miles) southeast of Berlin, off the "Staakow" exit of the A13 Autobahn.
It resides inside a disused hangar 360 meters long, 210 meters wide and 107 meters high. At 5.5 million m³ (194 million ft³), it stands as one of the largest buildings on Earth by volume, and is the world's largest single hall without supporting pillars inside. The hangar cost €78 million and was originally commissioned by Cargolifter AG as an airship hangar named Aerium, but the airship it was intended to house – the CL160 – was never built.