Unlike many reclaimed, abandoned mines, this Canadian cave system is still just a dangerous maze.

From mining complex to industrial exhibition, this museum once played a major part in the X-Files.

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

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.

Historic psychiatric asylum and most-filmed location in the Great White North.

This former smelter is a crumbling ruin, with the exception of its towering smokestack.

The second tallest railway trestle bridge in America.

A short hike into the mountainside forest reveals a decaying 1890s town.

People come from across the globe to swim in this lake believed to have healing properties.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

An obscure waterfall that looks like something out of a fantasy novel.

During its heyday, 72 one-ton buckets from this dredge bore into the Powder River excavating vast gold deposits.

Massive crater in central Oregon.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Every four years, millions of salmon fill a river so densely that its waters appear deep crimson.