A seven-story 1920s mausoleum outside Denver houses thousands of remains.

A mental health hospital dating back more than 139 years, now features a museum.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

Open-air cremations in Colorado's self-proclaimed spiritual mecca.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

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

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

Colorado's only true geyser is hidden within the San Juan National Forest.

There are eight natural springs around town, each with a slightly different taste.

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

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

A recreation of an Old West apothecary full of curios.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

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

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

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

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

Even in death, he's still your huckleberry.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."