A brilliant turquoise lake in the mountains.

Rusting ships sit in a desert where a sea used to be.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

According to one story, this burial mound is made up of stones that represent the casualties of a major battle.

Where you'll find anything but nothing.

A gorgeous stone viaduct crosses over a bucolic valley.

The memorial stands at the intersection of the rivers Morava and Danube.

Too much gossip or just missing curfew could land you in here for a couple of days.

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

The hairpin turns in this mountain road take the shape of a letter—is it a coincidence or a symbol of love?

A dragon-shaped fountain that is said to dispense healing water—unless you're evil.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

A Serbian monument to plums.

This historical village takes you back to the 19th century.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

This statue honors the first Relay of Youth.

Slovenia's first mosque is a striking mix of Islamic and modernist architecture.

This cutting edge museum details the history of skiing, from its ancient origins to its status as a sport.

A crumbling World War I fort that is reached through a series of concrete tunnels.

The "dragon babies" of southeastern Europe.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

This one-time health resort was used by aristocrats around the world.

One of the most important fortresses along the Danube now lies in ruins.