Tropical Islands Resort is a tropical theme park located in the former Brand-Briesen Airfield in Halbe, municipality in the district of Dahme-Spreewald in Brandenburg, Germany, 50 kilometres from the southern boundary of Berlin. It is housed in a former airship hangar (known as the Aerium), the biggest free-standing hall in the world. The hall belonged to the company Cargolifter until its insolvency in 2002.

Tropical Islands has a maximum capacity of 8,200 visitors a day. In its first year of operation it attracted 975,000 visitors, according to the operators. The Tanjong company reported 155,000 visitors in the business year February 2004 to February 2005. Approximately 600 people work at Tropical Islands.

Tropical Islands has a world record for the largest indoor waterpark. It is bigger than Canada's World Waterpark at West Edmonton Mall. It is also the fourth-largest building in the world by usable volume.

There’s also Tropino Club which offers bumper boats, miniature cars, and air hockey. There are also bigger waterslides means that even parents are guaranteed not to get bored.

Although traditionally water parks are thought of as family zones, Tropical Islands Resort offers plenty of options for adults, too. A lagoon modeled after one you might find in Bali is a good place for to soak in the sauna, and the “tropical sea” covers the area of three Olympic-sized pools, is kept at a balmy temperature, and is located under a clear roof so guests can feel the sun.

In case lounging by the pool under a sunny sky isn’t relaxing enough, there is a full service spa in the park. The resort also recently opened an outside area, called Amazonia, which is open year-round. Since temperatures in Berlin dip below freezing in the winter, this feature is probably best left for the brave-hearted, or for the summer. 

According to insider.com