One of the American Southwest's most extensive collections of Navajo rock art.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Legends surround this jagged rock formation in the New Mexico desert.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The trials and tribulations of marking Poe's grave.

Famously misunderstood wonder of the ancient world

These eerie outliers of the lightning bug family glow a mysterious blue color.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This geothermal hot spring hides beneath a slowly growing mineral dome.

The world's longest known cave system.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Where you can hail your favorite fictional commanders-in-chief.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Before Nixon, "watergate" meant canals.

A computer bug so primitive it was an actual insect.

There’s a hidden military meme engraved on the World War II Memorial.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.