In 1889, a small group of women began meeting to discuss literature, art, and other topics. Their every-other-week salon grew into a lending library that still exists today.

One of the first intercontinental ballistic missile sites in the United States.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Just a man taking his prehistoric pet for a stroll.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

Step into the cool deep past and unknown future of who begat who.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The world's largest collection of the world's largest objects is in one small Illinois town.

The first declared National Monument in the United States.

The only theatre in the world constructed specifically for sound movement.

This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A magnificent collection of imperial armor and weaponry.

This massive library holds what was once the largest book collection in the world.

The oldest stone house in Paris was built by its most famous alchemist.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

To find the "unicorns of the deep" you've got to go downstairs.