This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Only known mainland rookery of the threatened Stellar sea lion.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

America's oldest archaeological site or a muddled case of wishful thinking.

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

A derelict bit of transportation infrastructure hidden in the woods.

One of the last free public hot springs is decorated with hippie art.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

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

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This historic national park is covered in the stunning ruins of red rock pueblos.

This bridge is haunted by the ghost of a distraught mother.

Even Henry David Thoreau found this glacial pothole irresistible.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

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

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

Friction between grains of sand cause a curious "singing" sound.