Historic beer hall in Bucharest with magnificent stained glass and a lively folk band.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

This once-derelict building is now one of the most beautiful bookstores in the world.

The largest 19th century panorama in the world still in-situ.

This feat of German engineering is one of the only elevators in the world following a curved path.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

This monumental mural crafted nearly 40 years ago is still in perfect condition.

A tiny chapel and burial site lurk underground in Jajce.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This striking modernist mosque defies architectural conventions.

Controversial site of what could be Europe's first pyramid.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

These warring psychedelic crags commemorate an unsuccessful military operation.

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.

The place where World War I began.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

This historic cemetery was inaccessible for several years due to dozens of land mines.

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

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Oriental bazaar in the heart of Sarajevo.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.