Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

This sidewalk tribute honors Colorado's great culinary creation.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

Neal Cassady may still have an open tab at one of Denver’s oldest watering holes.

This Chinese-style quartz sundial was saved in its final hour.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This super steep hike ascends 2,000 feet in less than a mile.

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

A local shop filled with handcrafted art and funky home furnishings, vintage, and antiques.

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

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A statue high in a hill that represents how Buffalo Bill got his name.

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

Massive still life just off the highway in Kansas.

The bones of two medieval royal lions were discovered at the historic fortress.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

A tribute to an explorer and naturalist often overlooked by history.

The pockmarks across the building's facade are remnants of the Blitz.