A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

A shrine built to combat the bad karma of a commercial venture.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Morocco's Argania trees are infested with nut-hungry goats.

Five candy-colored villages on the Italian Riviera.

A striking symbol of the Bulgarian capital.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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.

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

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This extensive collection of dead bugs may be the world's most idiosyncratic and personal insect museum.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousands of well-dressed mummies below a monastery.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

What happens when you cross a mayor and a painter?

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A marvel of Byzantine engineering under the streets of Istanbul.