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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The "Seinfeld" diner.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

This groundbreaking 16th-century map is known as "America's birth certificate."

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Avoid gangster interaction while window-shopping.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The mall's looks were inspired by the cowboy extras who used to meet up—and cause real trouble—at this Hollywood hub.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The private clubhouse for the members of the Academy of Magical Arts.

A faux European lane smack dab in downtown L.A.

Dozens of feral felines rule a segment of Hollywood's only graveyard.

Because there's no place like home.

Resting place of Hollywood's immortals is also site of summer film screenings.

Legendary prop shop filled with one man's collection of scientific curiosities.

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

A second generation sun-powered marvel lights up the night.