This rooftop sign has been confusing Milwaukee-bound airline passengers for decades.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

Rippling sand dunes frozen in the Arizona rock.

A half-century-old handmade dim sum joint opens daily at 3:00 a.m.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

This hulking behemoth is actually five interconnected towers built in the 1960s.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

The remnants of a classic 1970's British film.

Tucked away in a small German apartment is an eclectic museum devoted to West African vodun culture.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

A surreal museum of extraordinary industrial objects.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

The history and future of cannabis.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

These lesser-known Maltese catacombs date back over 1,700 years.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This subterranean necropolis holds three floors of antler-dug grave caves.

This enchanting mountain plateau celebrates spooky local folklore.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.