Cavernous opening completely encased in Karst limestone.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

“It has nae lugs!”

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

This Little Rock legend has survived decades of rowdy crowds, three fires, and a zombie wedding.

Yup, that's where the name came from.

Springtime is go time for this repurposed shack and the fish it venerates.

This picturesque Victorian ghost town was once a thriving mill community.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

The Connecticut village named for its subterranean thunder.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

A historic jail preserves etchings from over a century of incarcerated people in a town with a rough and tumble past.

At the turn of the 20th century, the Minnehaha County courthouse played host to sensational public divorce trials.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

The secluded beach getaway from Wes Anderson's dreamy summer romance.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.