An intricate and amazing house built by architect Karl Junker.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

This frequently-photographed waterfall takes only a short hike to visit.

Hollowed out cedar log tubs set in an ancient towering forest.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Legend has it this 11th-century castle was paid a visit from the devil.

Site of one of World War I's most horrific scenes.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

A rare example of World War I trenches from the British front.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

The fairy tale castle of the "fairy-tale king."

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

This banal Parisian entranceway is not what it seems.

A chapel on a volcanic core, marking the end of a successful journey.

This 1,400-year-old abbey was once a powerhouse for music and intellectualism known across Normandy.

This secret cemetery where no flag is allowed to fly holds the bodies of American soldiers convicted of heinous crimes during WWII.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

A striking 12th-century-style castle built on the edge of a cliff.

A small but immensely extravagant palace built by the "Night King."

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Started as a kitchen garden, now the second largest botanical garden in the world.

The sign at the garden gate reads: "These Plants Can Kill."