One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

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

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

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

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

A surprising collection of bronze faces beneath a bridge in Loveland.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

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

The temporary burial site of the man who shot and killed Jesse James.

A memorial dedicated to the victims of the Columbine High School shootings.

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

A home covered with elaborate mosaic and other pieces of art.

A tribute to Loveland’s most famous sweethearts, who helped spread cupid’s message to millions.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

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

A hotel with a rich Wild West history of miners and bootleggers.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

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.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

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