We're aware of the Grand Canyon in Arizona, but there's another lesser-known sight — the Havasu Falls — that you shouldn't miss out on. The red rocks and vibrant blue waters make a really stunning contrast. Sources: Shutterstock and Corbis Images
Natural Entrance, Carlsbad Caverns National Park, New Mexico Carlsbad Cavern includes a large cave chamber, the Big Room, a natural limestone chamber which is almost 4,000 feet (1,220 m) long, 625 feet (191 m) wide, and 255 feet (78 m) high at the highest point. It is the third largest chamber in North America and the seventh largest in the world.