These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A mural and a few historical markers commemorate Denver's once-thriving Chinatown, which was obliterated in a racist riot.

A multiversal transit station located right below a highway interchange.

A home covered with elaborate mosaic and other pieces of art.

A collection of over 15,000 zines works to preserve DIY publishing culture.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A technicolor place of worship for Elevationists.

Memorial stone for GWAR vocalist, depicted in his iconic costume.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

At 207 feet, one of the world's longest continuous escalators.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

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

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A forgotten "city of water" underneath the famous Trevi district.