The AquaDom in Berlin, Germany, is a 25 meter tall cylindrical acrylic glass aquarium with built-in transparent elevator. It is located at the Radisson SAS Hotel in Berlin-Mitte. The DomAquarée complex also contains a hotel, offices, a restaurant, and the aquarium Sea Life Center.

The AquaDom was opened in December 2003. It cost about 12.8 million euros. The acrylic glass cylinder was constructed by the U.S. company Reynolds Polymer Technology. The outside cylinder was manufactured on-site from four pieces; the inside cylinder for the elevator was delivered in one piece. The Aquadom is the largest acrylic glass cylinder in the world, with a diameter of over 11 meters, built on a 9 meters tall concrete foundation. Filled with about 900,000 liters of seawater, it contains some 2600 fish of 56 species. The feeding of the fish and the cleaning of the fish tank is performed daily by divers.

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Currently the tallest building in the world is the Taipei 101 located in Taipei Taiwan . This was build in 2004 has 101 stories and a height of 508m / 1,667 feet . Some of the other tall buildings in the world are shown in the following picture :

Now there are 2 projects in the world fighting for the prize of the tallest building in the world. One is the the Burj Dubai which is going to have over 800m and the other one is Mubarak al-Kabir which will stand 1,001 meters (3,284 ft). This will be a $86 billion dollar project that will cover 2 square kilometers and will have a new airport, plus a large business center, conference areas, environmental areas, athletic areas, and areas that concentrate on media, health, education, and industry . Mubarak al-Kabir will take approximately 25 years to complete.

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