Haleakala National Park

Location: Hawaii

Year Established: 1916

Area: 29,093.67 acres (117.7 km2)

Annual Visitors: 1,142,040

The Haleakala volcano on Maui features a very large crater with numerous cinder cones, Hosmer's Grove of alien trees, the Kipahulu section's scenic pools of freshwater fish, and the native Hawaiian goose. It is home to the greatest number of endangered species within a U.S. National Park.