Cheyenne Frontier Days is held every July and is considered the largest outdoor rodeo in the world. It's a 10-day event and also features nightly concerts, a carnival, parades, and an air show.
Yellowstone National Park is partially located in Wyoming. It's the first U.S. national park, and is renowned for having the world's largest concentration of hydrothermal features, including the iconic Old Faithful. The park protects an immense 2.2 million-acre ecosystem.