An abandoned saucer-shaped monument in the Bulgarian mountains.

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

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

The social hall of this former factory is a Communist-era time capsule.

An homage to the medieval rulers of Bulgaria.

A decaying, yet still functioning, work of communist architecture.

These natural cliffs look like they are a part of an old castle complex.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

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

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

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

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

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

The growing stones of Romania.

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

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

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

The ruins of an early 1900s neo-Baroque mansion sit nestled in a local park in the Hungarian plains.

A museum of Hungarian military aviation in the middle of a small city.

The massive white mound and accompanying water terraces are a striking geological oddity.

An industrial site turned into Hungary's most cherished natural wonder.

Pay your respects to a country that only existed for a few weeks.

A serene memorial that honors the adventurous spirits of climbers who lost their lives in the High Tatras.

A perfectly preserved hill village where the buildings are painted like white lace.