A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

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

Bridge that died in war and was resurected.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

A museum glorifying the life of Stalin, located in the city of his birth.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The decaying remains of a once-luxurious Soviet spa town.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A free, public museum dedicated to the fascinating science of sight.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Its buzzing collection honors vibrator history.