The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This shrine is an ode to the region's rich Hispanic heritage.

Take a self-guided tour through one of Colorado's most elevated mining districts.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

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

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

This enigmatic building features numerous architectural styles.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

The home of a formerly enslaved man who went on to become a prospector, entrepreneur, and activist for Black rights.

The giant stump of the once towering cottonwood where Ute people held tribal meetings.

This massive home was constructed by one of the greatest conservationists in Colorado history.

This nearly abandoned town was once a thriving mining community until a series of fires.

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

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

According to local legend, a tree grew from the stake that killed this alleged vampire. In reality, he probably died from influenza.

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

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

Unlike most arches, this geological oddity formed in a volcanic dike.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.