The former home of the army detachment that captured Geronimo.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

More than a century old, this trading post resides in the Navajo Nation.

Arizona's first government hub is a rustic cabin now preserved as part of a historical museum.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

Giant telescope mirrors built in a spinning furnace under a college football stadium.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Take a monster truck tour around an ostrich farm in the middle of the desert.

This sanguine boulevard was named after a deadly cowboy bar fight.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

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.

An architect's childhood fantasy treehouse made real.

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

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

A geological mystery on Camelback Mountain.

This simple home was the beginning of a long journey for the iconic Western film star.

An eclectic assortment of medieval architecture in a small Iowa town.