A short tunnel built straight through a magmatic dike.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

This bee-themed family business does more with honey than anyone would think was possible.

An environmental art installation inspired by farmhouses and crop circles.

One of the oldest continuously operating amusement parks in the U.S. is an open-air museum of Art Deco and neon lights.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

One of the oldest art supply stores in the United States.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

This Colorado fire station has been in continuous operation for more than a century.

All that remains of this once-booming mining town are the ruins of a saloon.

The decaying ruins of a failed mining company’s water diversion project cling to the side of a desert canyon.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

The remains of an early 1900s dude ranch that operated until the 1970s.

Take a dip in the world's largest mineral hot springs pool.

16,500-acre ranch filled with American heritage, geological wonders, and a giant pile of tires is the crown jewel of an intriguing tug-of-war.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

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

Two creeks flow out of either end of this canyon in opposite directions.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A coal fire has been burning underground here since 1896.