Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

This scout retreat, still in use today, was the filming location for the original “Friday the 13th” film.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The first pet cemetery in the United States.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

Murder, searching for gold, and being cut in half—the memorial statue of Daniel O. McCarthy and the Pioneers of '49

This jagged colossus of a building is mostly held together by an enormous concrete exoskeleton.

This grand memorial remembers the 20 members of the Los Angeles Times killed when the office was bombed.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

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

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

This Hollywood dive houses a mural painted by the artists who animated its namesake film.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

This 'Murder House' grand mansion has starred in everything from Bones to Buffy.

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

Dedicated to the explorer who opened Japan to the West.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.