When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The largest source of fossilized insects anywhere.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

On the side of Arkansas' Great River Road stand the remains of a forgotten World War II POW Camp.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

Town not known for anything except its strange name.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The second oldest continuously operating bar in Louisiana.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Rusted and decayed, this former mining site is a portal to the past.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

This 1854 courthouse along the Mississippi River has a storied history.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.

A museum dedicated to man's boldest venture.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant granite rocks standing end-to-end like a train of circus elephants.

Erosion and time have created a naturally-formed water park.