For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

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

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

A unique hotel for the artistic soul.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

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

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

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

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

An abandoned saucer-shaped monument in the Bulgarian mountains.