Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A sweet symbol marks the place where torturous executions were once carried out.

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

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

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

An oddly conical beacon perched atop beautiful Irish cliffs.

A ring of soy sauce bottle bases decorate an important Singaporean landmark.

From prostitutes to soldiers to business men, the dead in this graveyard are a microcosm of Singapore's history with Japan.

A real-life "hobbit" cave in Flores, Indonesia.

Once home to Komodo dragons, this island dreamscape has a rare combination of white, pink, and black sand beaches.

This sacred cave temple is home to thousands of bats and according to legend, a giant snake king.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

These caves secretly held national treasures during World War II.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

This ancient hydrological marvel is now the base of a modern outdoor cinema.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.