A little-known hot spring haven right below the highway.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

No one seems to know who suffered the disappointment at this particular place.

The most photographed house in Maine looks good enough to eat.

Five acres of divinely inspired folk art.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

Jacksonville's highways rendered this century-old grammar school unusable.

One of the now-less-hidden floral gems of the "Emerald Necklace."

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

This recreation of a 19th-century dime museum is full of oddities.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

More tin toys than you can shake a clapping monkey at.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.