During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

The Guardian of Tallinn.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

The place where World War I began.

A war-torn Olympic relic is being overtaken by graffiti and nature.

Bridge that died in war and was resurected.

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

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

Sofia's legislative center is continuously reinventing itself.

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

A striking symbol of the Bulgarian capital.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

Glowing orb in Minsk houses 8,600,000 items.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

An ancient capital city that dates back 3,000 years and harbors many surprises.

On holy holidays, Israel's second president used this room atop Mount Zion as a refuge to read the Torah.