This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

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

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

An abandoned Byzantine fortress and notorious prison.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

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

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

A bus with a butt and biceps to put Olympic athletes to shame.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Space-age monument to an early 20th-century uprising.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

"Unity, Creativity, Beauty."

An homage to the medieval rulers of Bulgaria.