The burial place of one the greatest Arthurian authors, with the sword in the (grave)stone.

A 100-year-old Japanese command center is now a unique underground university walkway with periodic exhibits.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

Inside the Finchingfield Guildhall, two sticks that belonged to alleged witches in the 17th century.

An Orlando museum houses the world’s most comprehensive collection of work by Louis Comfort Tiffany.

The remains of a boarding school designed to forcibly assimilate Native American children.

A unique collection of old miners' cave homes carved in to the hillside cliffs near Death Valley.

Now a ruin, this grand resort was coveted by a communist autocrat and an eccentric Japanese golfer.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Around 30 ship figureheads are housed at this 11th-century abbey and gardens.

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.

Tropical paradise strewn with hundreds of World War II wrecks.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

An opulent testament to the boom-and-bust history of industry in north central Indiana.

The watery grave of Captain Bligh's famous ship.

At low tide, you can see the remains of a 17th-century ship just off a Stockholm island.

A century-old miner's quarters turned mansion.

Final resting place of two dozen New York City harbor ships.

The rusting hulk of a hand-powered, nearly 160-year-old submarine abandoned in 1869 due to the ravages of decompression sickness.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

This church was transported brick by brick from the ruins of a 16th-century city into Panama City's current historic district.

A lonely cemetery holds the history of a gold mining town turned ghost town.