One of Philadelphia's largest murals resides hidden under this bridge.

This dramatic rail curve was once the target of a failed Nazi attack.

A field of nothing but boulders which resembles a giant's gravel driveway.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A music-filled, booze-soaked oasis in the desert.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

This balancing rock is one of Utah's most unusual geological formations.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Newfoundland's last remaining granite lighthouse.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This rural museum highlights Wyoming's era of trapping and fur trades, and hosts the annual Green River Rendezvous in July.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Step into a pastel time capsule where candy is truly dandy.

A museum dedicated to the alleged Roswell Incident.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.