This naturally-sourced hot spring is now home to a clothing-optional resort.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.

The same security that protects our nukes accidentally protected a gentle herd of antelope.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A popular rock that acted as a waymarker for American pioneers.

One of the smallest towns in the United States.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Eighty million natural history specimens call this gargantuan museum home.