A decommissioned military complex that's now a modern industrial park.

Once a popular watering hole among longshoremen and shipyard workers, this neighborhood treasure spans more than 100 years of Red Hook history.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

Walk into the 19th century without leaving Brooklyn.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The oldest continuously operating fish market in the United States.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

An eerie collection of the surviving structures from a past celebration of the future.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A 16th-century Andalusian palace.

The final resting place of the great navigator, or maybe his brother.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

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.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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