U.S. Outlying Islands

An uninhabited coral atoll near the equator in the central Pacific, formerly used as a guano mining site and WWII bombing target, now a wildlife refuge threatened by rising sea levels.

An uninhabited coral atoll very close to the equator in the Pacific, famous as the intended refueling stop for Amelia Earhart's ill-fated 1937 world flight, now a wildlife refuge with an abandoned airstrip.

A small Pacific atoll used as a nuclear test site in the 1950s and later as a chemical weapons disposal facility, now a closed and fenced wildlife refuge with restricted access.

A remote Pacific atoll near the northwestern Hawaiian Islands, site of the pivotal 1942 Battle of Midway and now a wildlife refuge protecting one of the world's largest Laysan albatross colonies.

A pristine, uninhabited coral atoll in the central Pacific, covered in coconut forest and surrounded by vibrant reefs, now protected as a nature preserve by The Nature Conservancy.

A remote Pacific atoll roughly halfway between Hawaii and Guam, used as a critical aviation waypoint before WWII and today an active US Air Force base with restricted civilian access.