The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

The longest hedge maze in the world.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The secret city built by the Manhattan Project.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Ruins of a German Castle on top of a towering stone pillar.

Northern Ireland's Brobdingnagian stepping stones.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This naturally-sourced hot spring is now home to a clothing-optional resort.

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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Take a drunken tour inside the world's largest known geode.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Famously misunderstood wonder of the ancient world

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The first declared National Monument in the United States.

The world's largest collection of witchcraft regalia.

Mysterious rocks that ring musically when struck.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.