Steadily reminding Czechia of its past.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This man-made mound monument was built out of soil from all across the Polish empire.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Sweden's oldest animated sign is still lighting up the skyline today.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

100 year tradition of fist fights, marked by marble footsteps.

The only museum with its curator—and her pets—buried inside.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This bridge was constructed from the rubble of the infamous Bastille.

A charming flea market shop dedicated to retrofuturistic apparati.

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.

The broken skateboards that became a poignant memorial to a murdered skater.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Catacombs turned marketplace.

Like something out of a pulp adventure, this abandoned plane wreck is slowly being retaken by the Caribbean jungle.

One of the largest underground systems runs under Canada's largest urban center.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.