This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

"Unity, Creativity, Beauty."

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.

UNESCO-protected ancient burial ground.

A striking symbol of the Bulgarian capital.

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

A flamboyant five-story building in Bulgaria resembles a crawling snail.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

This Romanian village may have been drowned, but it is long from forgotten.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Museum dedicated to the terror regimes of Hungary.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.