The largest island on the great salt lake is home to curious creatures and strange stories.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

The most alien-looking place on Earth.

Once the most densely populated place in the world, this island is now a ghost town.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Monastery, army base, and infamous Soviet Gulag in the far Russian north.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

Island wonderland for communist autocrats.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

Final resting place of Antarctic explorer Ernest Shackleton.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

An abandoned colonial French prison notorious for its hellish conditions.

Wallabies live naturally on this Irish island.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

Island, once a pirate hideout, now home to an abandoned resort.

The Uros people live on floating reed islands in lake Titicaca.

The first island in the world designated a light-pollution-free astronomical observation point.

The final stronghold of a king whose feet never touched the ground.

Remote, volcanic island that Darwin, Hooker, and the Royal Navy shaped into a thriving, artificial ecosystem.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

We heard you like volcanoes so we put a volcano in your volcano so you can die for sure...

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.