Historical marker that is a mini replica of the original in New York.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

This Colorado fire station has been in continuous operation for more than a century.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

There are eight natural springs around town, each with a slightly different taste.

The largest source of fossilized insects anywhere.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Elvis's own personal tropical hideaway.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

Mostly underground in the old days Back in the USSR, today the Beatles beckon to tourists from a wall sculpture out in the open in central Russia.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

Church built on the site where the last tsar of Russia and his family were killed.

An iconic Soviet statue of working-class people.

This massive monument honors the first human in space.