These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

The dining hall that nourishes workers in Chornobyl's Exclusion Zone is also open to visitors.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Neo-cave art on the macro scale.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Tel Aviv's popular neighborhood went though endless waves of transformation.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

This delightful little museum is dedicated to only one thing: pasta.

An ancient fortification lives on in this Chinese city.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

Rainbow shutters decorate this former police station.

Constructed on the ruins of a convent, this tower saved countless lives.

This uniquely designed bridge served as the city gate for Comacchio.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

This effigy of Peter the Great is greatly disproportionate.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.