A naturally beautiful, seemingly bottomless deep blue spring.

Monasteries on rock pillars, once accessible only by frayed ropes.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Gigantic water vessel, permanently grounded in Southern Albania.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

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

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Budapest's Communist-era statues, banished to the suburbs.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.