This jail which was in service for over a century is now open for curious visitors.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

The graffitied ruins stand hidden within the Pennsylvania woods.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

It would take 35 firetrucks to fill this enormous glacial pothole.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

The world's largest and most outstanding marl lake regularly changes color.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.

The stunning remnants of this wreck emerge from an otherworldly backdrop of rainforests.

Earth's greatest purely vertical drop at 4,101 feet.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.

The remains of a paranoid inventor's hidden workshop lie in beautiful ruins amidst a Canadian park.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

Few other hotels can rival the grandeur of the Castle in the Rockies.