Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Along a California highway is a kind of Jurassic Park made of metal.

One of Scotland's earliest hydroelectric power stations.

No one knows the origins of the mysterious stone ruins discovered on a hillside in Halifax.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The secret medieval communication system will whisk your words above the noise of the crowd.

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

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

More than 70 detailed dioramas—including some rather nontraditional ones—fill this charming museum.

The Pope’s secret escape route.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

One of the most important yet well-hidden museums dedicated to the history of medicine.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

An alchemist's "magic door" stands in the middle of a Roman park.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.