The remains of Crystal Palace Great Exhibition of 1851.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

Ruins of a Carnegie family mansion on Cumberland Island.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Unicorns, elephants, and bears, oh my!

Mysterious stone tower featured in many alternative histories of the New World.

Oldest synagogue in the United States.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

World's largest permanent maze made of 18,000 conifers.

Jesus' footprints and the first catacombs in the world.

A table rock formation that has been intriguing West Virginians for years.

A curious cave church carved into the face of a cliff.

An ancient knight and a symbol of the city's freedom.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Humble beginnings for one of the world's most famous scientists.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

An apparition of Virgin Mary in Herzegovina.

Bridge that died in war and was resurected.

The only gulag ever to exist in socialist Yugoslavia.

Island wonderland for communist autocrats.

One of the largest caves in the world open to the public.