This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

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

"The prettiest love letters in the world" ... or so said Lord Byron.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

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

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This massive subterranean fissure is known as the "underground Grand Canyon."

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

The only sea in the world that has no land boundary.

A daily replay of the experiment that proved the rotation of the Earth.

A larger-than-life monument to the overlooked women who braved Western expansion and broke down societal barriers.

An annual extravaganza of Broadway theater memorabilia.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

One of the most controversial statues in Romania is an emperor with no clothes.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

One of the best places to see feral Colonial Spanish Mustangs in the United States.