Dynastic Home of the De Piro Family.

Ancient mysterious ruts carved in the bedrock.

This unique building in the main square stands out among the city's typically Baroque architecture.

A centuries-old forgotten underworld lies beneath Malta.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

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

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

A Museum of Psychiatry in a still-operating mental institution.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

This extensive collection covers thousands of years of Polish military history.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

When the Soviets destroyed the historic Armenian monastery they somehow left its bell tower intact.

These coffin-like Brutalist balconies were inspired by a nearby mine.