Five candy-colored villages on the Italian Riviera.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

One of Ireland's most infamous prisons for rebels including men, women and children.

A painfully obvious spy house sits right across the street from the Russian Embassy.

An underground city of salt.

A marvel of Byzantine engineering under the streets of Istanbul.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

Museum about life, death, and cannibalism in the Stone Age.

An astounding collection of medical specimens, including bits of President Lincoln.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Roman ruins top white travertine terraces formed by ancient hot springs.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A fascinating insight into daily life in the Eastern Bloc.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

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

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This free, take-a-book shop seems like a trick but isn't.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The oldest surviving synagogue in New York City is now a soaring art space.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.