This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

The first declared National Monument in the United States.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Every president in history is immortalized in bronze in downtown Rapid City.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

In addition to fishing and camping, this spot in Nebraska’s Sandhills is one of the world’s darkest places.

This now-abandoned outcrop is an important Native American spiritual site, overtaken by European settlers and mining pollution.

An ancient wall in the shadows of the Amber Castle.

The population of Southeast Asian primates was introduced to Mexico in the 1970s.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

The walls and streets of the ancient city are peppered with penises.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

A sculpture serving as an homage to Pope John Paul II.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.