This Iron Age hill fort remained hidden until a series of storms revealed its history.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

Eyam took steps to quarantine themselves and keep the plague from spreading.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

These wooden pipes were crucial to providing water to Medieval Edinburgh.

The remains of Crystal Palace Great Exhibition of 1851.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

The fragmented remains of a massive public bath connected to the city's water supply.

A quiet country churchyard holds a monument to the last known sin-eater in England.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

Yup, that's a 330-foot yacht passing over the highway.

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The southernmost outpost of the Russian Empire in colonial America.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

A swath of France so devastated by war it is still forbidden to go there.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.