Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

"Holy Wisdom" overlooks the city that became its namesake.

Secret refuge and museum of the Duke of Florence.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

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

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

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

This historic black and white monastery is one of Bulgaria's architectural jewels.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Christ's blood preserved in a Belgian town.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

An Art Nouveau building covered in animal gargoyles and grotesques.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.