Cody, Wyoming, was founded in 1896 by investors including Buffalo Bill Cody who had high hopes for prosperity thanks to local irrigation, great scenery, and nearby Yellowstone National Park. Prosperity finally arrived early in the 20th century with the Burlington Railroad and, eight miles away, the federally financed Buffalo Bill Dam. Cody remains one of Wyoming’s premier tourist towns.

On May 16, 1986, David and Doris Young took 154 people hostage at the Cokeville Elementary School in tiny Cokeville, Wyo. and detonated a bomb inside. The Youngs both died that day. Everyone else survived, and many who did recalled the tragedy with memories of the presence of angels.

Remains of at least seven mammoths, probably from a meat cache dating back more than 11,000 years, were found when the Colby Mammoth site east of Worland, Wyo., was excavated by a crew under Wyoming State Archaeologist George Frison in the 1970s.

Como Bluff in Carbon County and Albany County, Wyo., is the location of one of the world’s richest quarries of Jurassic dinosaur bones. Paleontologists found excellent dinosaur fossils in greater quantity here in the late 19th century than had ever been known before. These included Allosaurus, Diplodocus and Apatosaurus. Many of these specimens are still on display at the Peabody Museum at Yale University, the Smithsonian Institution’s National Museum of Natural History in Washington, D.C., and the American Museum of Natural History in New York City. The site is seldom quarried today, as most of the bones have been removed. Como Bluff is listed on the National Register of Historic Places.

The Connor Battlefield is a park on Tongue River in Ranchester, Wyo., marking the spot where Brig. Gen. Patrick Connor and about 475 U.S. troops and Pawnee scouts in August 1865 attacked a village of 500 Arapaho under the leadership of Black Bear and Old David. The Arapaho suffered 33 killed, and the troops burned their lodges and drove off most of the horse herd. Today the park offers picnic grounds, a campground and a monument to the event.

On Aug. 29, 1865, troops under Brig. Gen. Patrick E. Connor attacked an Arapaho village near present Ranchester, Wyo. Connor’s detachment was part of a large expedition ordered to subjugate the warring Cheyenne, Sioux and Arapaho in the Powder River Basin. Overall success was mixed. Connor was relieved of his command.

Converse County, Wyo., lists Triceratops discoveries and the annual Wyoming State Fair among its claims to fame. As happened with many of the state’s counties, the economic commerce created by the arrival of the railroad brought more people and more possibilities to the area.

What’s now Crook County, Wyo., was crossed by Custer in 1874 on his expedition to the Black Hills, the spark that led to the final struggles of the Indian wars on the northern plains. Ranchers a few years later brought in cattle and later, sheep, and the county was organized in 1885, with its county seat at Sundance. Harry Longabaugh, a.k.a. the Sundance Kid, spent 18 months in jail there. Coal deposits were exploited in the 1890s and shipped by rail to gold smelters in nearby Lead and Deadwood, So. Dak. Devils Tower National Monument, established in 1906 as the first national monument in the United States and still a sacred place for the Sioux, is located in Crook County. Agriculture, mining and timbering still play significant roles in its economy.

In the year of Custer’s defeat, Gen. George Crook led three expeditions into the Powder River country to subdue free-roaming Lakota Sioux and Cheyenne bands. The tribes defeated his troops twice and prevented them from linking up with Custer. On the third expedition, Crook’s soldiers destroyed Dull Knife’s village of Northern Cheyenne.

The story of uranium in Wyoming is a high-stakes drama whose cast includes fever-driven prospectors, ranchers defending their property rights, government officials intent on national security, entrepreneurs, engineers and world-class mining companies.