Underground monastery and fortress.

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

This striking icon of the disputed Republic of Artsakh caused a stir at a Eurovision Song Contest.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

The palace of the King of Kings, burned by Alexander the Great.

This bazaar is one of the oldest in the Arabian world.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

A 200-year-old prison that now houses a peculiar crime museum.

Structure built from the skulls of vanquished foes.

Bridge that died in war and was resurected.

A curious cave church carved into the face of a cliff.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

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

These warring psychedelic crags commemorate an unsuccessful military operation.

A futuristic, brutalist masterpiece that is also strangely prison-like.

A 11-foot former president stands on a Kosovo street that also bears his name.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

A small part of Russia that does not touch any other part of Russia.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.