The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A popular day's outing in Bovington consists of watching military tank driving practice.

A unique waterfall that some believe attracts the fairfolk.

These picturesque ruins crumble beautifully into the ocean.

A circle stone within a stone circle.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Abandoned Air Force base that has fallen into disrepair.

A Saint Nicholas-themed ghost town in the Mojave desert.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

Don't blink or you'll miss it.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An ornate century-old elevator still connects the two halves of Bad Schandau.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

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

A Spanish town built into the cliffs.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.