This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

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

An ancient knight and a symbol of the city's freedom.

Famously misunderstood wonder of the ancient world

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A tiny church on a man-made island in the Adriatic.

Bridge that died in war and was resurected.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

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

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

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

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This Transylvanian church has changed its denomination four times.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

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

This massive monument was unveiled the day Kosovo declared independence from Serbia.

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

Where commuters walk through remnants of an ancient Greek necropolis.