Las Vegas attraction The Aquarium at the Silverton Hotel is truly a site to see, by all accounts. The 117,000-gallon saltwater aquarium holds more than 5,000 beautiful and exotic fish including three species of stingrays and sharks. The best part? It's free to watch the fish and animals swim around the breathtaking coral. In addition, visitors will be able to catch one of the marine biologists feeding the fish, just find out the routine times to capture the feeding frenzy for an unforgettable Las Vegas experience. This is definitely fun for the whole family and demonstrates how Las Vegas is not only the sin city, but also doubles and educational Mecca.