One of the greatest maze designer’s greatest mazes.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

Microscopic scenes; some call it novelty, some call it art.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

An extravagant monument to an extravagantly unpopular Emperor.

An ornate tomb pays tribute to one of the most influential and cherished military leaders in Vietnam's history.

A sculpture park that takes the use of clay to a whole new level.

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.