Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

An underground city of salt.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Pompeii's less famous neighbor is still revealing her secrets.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

The amazing wonder cabinets of a very rich Austrian archbishop.

A church of bones, decorated with 40,000 human skeletons.

Caves famous for the dragon-slaying saint who lived there.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Centuries-old bridges grown from tangled roots.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Stalactites and stalagmites in a beautifully lit cave.

Ancient cave tombs known as the "houses of fairies."

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The remains of diamond fever taken over by the desert.

Catacombs turned marketplace.

Floating pink tap installed for a flower show in London.

Scattered throughout London are ancient remnants of the city's former bounding wall.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.