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

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

An architect's childhood fantasy treehouse made real.

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.

The first declared National Monument in the United States.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

The maritime museum that boasts the largest nautical library in the western hemisphere.

A bygone village occupation lives on via this quaint public chalkboard.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A cemetery housing wild west legends in South Dakota.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

Paths are maintained, but trees have taken over plots.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Oldest unrestored plantation house in America that is open to the public.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

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