A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

These ruins saw a second life as a cemetery.

The oldest philatelic museum in the United States.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

Each spring, residents of this Czech town hoist a 'slain' metal dragon onto the city hall to commemorate a local medieval legend

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

An extensive network of secret tunnels was created for the Nazi project "Riese."

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

A hidden gem full of oddities, curiosities and macabre antiques.

Distressing images of the Last Judgement adorn the walls of this medieval sanctuary.

This ancient Corinthian helmet is South Korea’s only national treasure of Western origin.

At the entrance of this chapel is a fresco commemorating the dead from the plague outbreak of 1630.

Over 40 species of fern cover the canyon walls of this lush green bowl, cut off from the bustle of the world by a cave entrance.

The ruins of a military fortification sit atop this mountain.

Remnants from a time before electricity.

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

Two minuscule windows are tucked inside this medieval building.

This ancient gaming tool was unearthed during the construction of this former town's central square.

An Antoni Gaudí masterpiece in Astorga.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

A huge Soviet-era robotics factory in the outskirts of Pripyat, now long-abandoned.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.