#3 The pools of Tropical Island Resort, Krausnick, Germany
Tropical Islands Resort is located in Krasnik, Germany. This resort has been given the title of the world's largest indoor water park. Built as a Zeppelin hangar, this resort has been converted into a vibrant adventure park after being bought by a Malaysian company. It consists of a lot of artificial beaches, palm trees, rainforests, etc.
The building of this resort is one of the largest buildings on earth. In 2004, this place was converted into a luxurious artificial tropical resort. It has artificial sunlight, warm temperatures, sandy beaches, and accommodation in tents or cottages. 6000 guests can stay here simultaneously and enjoy balloon rides.