A stealthy Apache hideaway that became the haunting site of a mass grave.

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

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

A picture-perfect town, perfect for blowing up.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

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

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The longest living non-clonal organisms on Earth.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A sculptor's dream castle turned fantastical ruin.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

A wondrous old library overlooking the nation's capital.

This glamorous old building is said to have inspired the Tower of Terror.

The beauty of urban decay, hiding some dark secrets.

One man's ambition created this psychedelic log home.

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

When ecosystems collide in the arid Southwest.

An extraordinary mixture of natural beauty and man-made phenomena.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.