A 18th century graveyard and its astonishing cortege of macabre iconography.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

This medieval castle is filled with an eccentric collection that ranges from ancient Egyptian artifacts to taxidermy to a mummified hand that was cut off during a duel.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

Elevated freight railway turned wildly successful urban park.

The most confusing clock in New York.

Try not to get slimed in Tribeca.

A open air theatre built on a cliff by an eccentric British woman.

The Last Home of an Executed King.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

A public urinal so pretty, it was declared a national monument.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

This former sewage pumping station is now a fascinating museum.