The first declared National Monument in the United States.

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.

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

The humble beginnings of the man known for his lavish "champagne" music.

A true roadside icon standing on the same plains that the herds once roamed.

Only place outside China and India where two overhead DC power lines cross.

A monument to the center of the North American continent may be off by a few miles.

In this relatively flat state the highest point is an honored place.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

What is it about mushrooms that makes people wish they lived inside of them?

This magnificent Cincinnati graveyard is also a popular public park.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

The final resting place of the most famous sharpshooter.

A miniature world of concrete and stone in Springfield, Ohio.

The largest ancient burial mound in Ohio.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

Travelers exchange letters with woodland creatures at this mini post office.