Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

A stunning 18th century pharmacy and medieval chemist's collection.

Something's watching you.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

This 11th-century structure is one of the oldest churches in Romania.

A giant portrait of an ancient king looms over the river.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

The romantic botanic tunnel feels like a well-kept secret.

The final resting place of one of the first alleged vampires.

Moss and stone turn this waterfall into an otherworldly liquid veil.

The growing stones of Romania.

A muddy alien landscape that is home to rare species of exotic plants.

No one knows who built this strange cave of worship or exactly why.

The foundations of a forgotten fortress, wedged in between two streams.

The dramatic remains of an abandoned farmhouse sit high on the edge of a remote hillside.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

This French chateau is home to the world’s largest private collection of fighter jets.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

You would never come across this tiny green oasis if you didn't know it existed.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

The bomb-ravaged remains of of a colossal Neptune.