A riverside tiny house with books and other treasures galore.

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

No one knows exactly how deep the world’s deepest geothermal hot spring is.

This Native American settlement dates back to the Pueblo II period.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

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

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

A quiet rock and botanical garden is the beautiful centerpiece of Fort Lewis College.

A historic building houses one of the most important archaeological institutes in Europe.

An important example of architectural history slowly decays in the city center.

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

Legend says this sacred tree was a gift from goddess Athena.

A museum of natural history, Edwin Carter's original log cabin home and workshop houses taxidermy specimens.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

It's safe—and permitted—to walk across these twin natural sandstone arches.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

According to legend, this ancient column contains healing properties.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

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

These caves secretly held national treasures during World War II.

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