In Berlin, inside the Radisson Blu hotel, you will find the AquaDom aquarium.
This aquarium is recognized in the Guinness Book of Records due to its location, size and shape. With a cylinder of 11 meters in diameter and a height of 25 meters, there is a panoramic elevator hidden in the center that takes 5 minutes to cover the distance.
This unique aquarium houses a coral reef and thousands of tropical fish, up to 2,600 fish of 56 species swimming in one million liters of salt water.
If you want to complement the information you can do so in this article