Tropical Islands Resort is the largest indoor water park in the world. It is located in Brandenburg, Germany. The Tropical Islands Resort has a 107-metre-high hangar that stands as the world’s largest single hall. It has no supporting pillars inside. In the Tropical Islands Resort, there are a rainforest, beach, artificial sun, palm trees, orchids and birdsong. It has the world’s biggest indoor ‘rainforest’, which features over 50,000 plants. The complex is open year- round, 24 hours a day, with a multitude of attractions to keep you busy.