This irregularly shaped sea fortress has defended not one but three different sovereign states.

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

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

Oriental bazaar in the heart of Sarajevo.

The place where World War I began.

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

The sad remains of a monument to martial arts legend and movie star Bruce Lee—in the middle of Balkans.

Bridge that died in war and was resurected.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Eat the ultimate iteration of Portugal's most beloved pastry.

A historic lighthouse steeped in rumors of ghost and pirate stories.

Ride the subways of yesteryear.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

France's national museum of scientific and industrial instruments.