Standing prominently off the main entrance of a private residence in Saudi Arabia is a large aquarium shaped like a horseshoe. The aquarium measures 25 feet long x 5 feet wide x 5 feet high (7.6m L x 1.5m W x 1.5m H). Filled with more than 5,800 gallons of saltwater (nearly 22,000 liters), the aquarium is home to a variety of colorful, tropical fish.