The oldest housing complex in Riga is a mini timeline of architectural trends.

A quirky little wax museum is home to some of the most famous Serbians in history.

An idyllic traditional timber village on a picturesque hill was built for a film.

Near Belgrade, an ancient-looking sarcophagus serves as a World War I monument.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

A pair of connected skyscrapers form this symbolic gateway.

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

Structure built from the skulls of vanquished foes.

This rose and lavender oil distillery still operates as it did more than a century ago.

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

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

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

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

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

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

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

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

A striking symbol of the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.