A popular Icelandic children's story comes to life inside this cave.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This giant temperature attraction created some giant electric bills.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

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

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A spiritual vortex among the red rocks in Sedona.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Sniff the Titan Arum's rotting flesh.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

One of only two commuter aerial tramways in the United States.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The legendary building that needed ghostly approval before being built.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

Some of the Old West's most notorious outlaws frequented this mining town.