Once the home of a hermetic monk, this cave now houses a small church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

An abandoned Byzantine fortress and notorious prison.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This once-derelict building is now one of the most beautiful bookstores in the world.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Structure built from the skulls of vanquished foes.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

The first mosque in the world to receive electricity.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Small church on top of a huge rock column.