The park was named after the stratovolcano of Mount Katmai. First, the area was designated as a national monument in 1918 to ...

Ganitch went on to outlive the USS Pennsylvania, serving aboard the USS Mt. Katmai during the Korean War before retiring from the Navy on Oct. 10, 1963.

Location: Katmai National Park and Reserve, Alaska Coordinates: 58.52902460873731, -154.92701312762296 Why it's incredible: The crater is perfectly round, and nobody can tell for sure how it formed.