A castle perched precariously over the Crimean Sea.

Hungarian mummies in beautiful painted coffins.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

"Medieval" castle built in the mid-20th century by one family.

Apartment complexes built into huge repurposed natural gas tanks.

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

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

The largest catacomb system in the world.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

Volcanic irregularity? Odd erosion? Alien eggs? Local legends compete to explain these strange orbs.

Enormous statue of the Emperor of the Mongols.

The tallest stationary dunes on Earth also happen to sing.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Iconic pyramid from famed British architect Norman Foster designed to represent all of the world's religious faiths.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

An entertainment center in a huge transparent tent.

One of the most horrible legacies of the Cold War is a site where the Soviet Union tested nuclear bombs on civilians.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

Lonely minaret stump of a destroyed city.

Mysterious spherical rocks in the semi-desert of western Kazakhstan.

Light still pours into the ruins of this ancient Islamic observatory.