This centuries-old Italian chapel hangs midway down a sheer cliffside.

World's first "penitentiary," meant to be humane, drove men insane.

One of the world's largest collections of pathological specimens.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This South London cemetery holds the remains of more than 15,000 people.

A submerged archeological park still holds the wonders of a Roman Sodom.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

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

One of the oldest living oak trees in the Southeast.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This expansive bridge in the Canadian wilderness was originally just built for friends.

The eccentric mansion of one the most popular horror authors of modern times.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A perilous medieval road leading right into the sea.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Rome's ancient Etruscan rival, now a park full of ruins.

This abandoned cemetery has a dark past of bodies buried over bodies.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.