Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

An abandoned convention space that has been left to the homeless and the radical.

Abandoned Air Force base that has fallen into disrepair.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

This mysterious and creepy location instills a strong sense of foreboding in all visitors.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

This stately structure has been abandoned for half a century.

The remains of a 12th-century chapter house in Golden Gate Park.

Radioactivity still cause for concern at this urban explorer's paradise.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.