The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Home to Hollywood history and a very special salt crystal.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

France's national museum of scientific and industrial instruments.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

An Australian lake whose pink hue defies scientific explanation.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Tropical paradise strewn with hundreds of World War II wrecks.

Science fiction's grandfather has a fittingly marvelous tomb.

An archive of nearly every day of Buckminster Fuller's life.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

A magical world of elves and fairies tucked amongst the trees in Colombia.

This little-known relic crypt holds stolen parts of a Roman Empress.

A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

Private collection of art inspired by cabinets of curiosity.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Even King Tut was intrigued by the glass of the Great Sand Sea.

The world's largest collection of witchcraft regalia.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.