They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Prehistoric animals decorate this popular outdoor park.

Ruins of a Carnegie family mansion on Cumberland Island.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

San Francisco Bay's ghost town.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Abandoned power station once home to a squatter community, now being developed into an arts center.

One of the ghostly stops along Route 66.

A painfully obvious spy house sits right across the street from the Russian Embassy.

America's only nuclear missile silo open to the public.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The loneliest island in New York.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

The secret city built by the Manhattan Project.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The crumbling remains of a 19th century fortess.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.