This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The latest in a series of long glass bridges suspended at terrifying heights.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

Palace where the nearly un-killable Rasputin was murdered.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Home to three historic ships from the age of Vikings.

Copenhagen's celebrated theme park and gardens.

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An abandoned outdoor movie theater in the Sinai desert.

The best place for scenic views of the DMZ and North Korea.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Decades before the scandal, this staircase on the river was a literal "water gate."

Before Nixon, "watergate" meant canals.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

Parking garage where Bob Woodward met Watergate source "Deep Throat."