1. In 1864, the state of Nevada was officially admitted to the Union as the 36th state. This event took place on May 25th, making it a significant day in Nevada history.

2. In 1935, the Hoover Dam, one of the largest civil engineering projects of the 20th century, was completed. The dam spans the Colorado River and straddles the border between Nevada and Arizona. May 25th was the day the last bucket of concrete was poured, making it a historic day for Nevada and the United States.

3. On May 25, 1977, the MGM Grand Hotel in Las Vegas caught fire, leading to one of the deadliest hotel fires in U.S. history. At least 85 people were killed and more than 600 were injured in the fire, which was caused by an electrical issue.

4. In 1985, Las Vegas hosted the world's largest charity walk for muscular dystrophy on May 25th. More than 5,000 participants walked 5 miles to raise money for the Muscular Dystrophy Association.

5. May 25, 2018, marked the official opening of the T-Mobile Arena in Las Vegas. The arena is a state-of-the-art entertainment venue and home to the Vegas Golden Knights, the city's first professional ice hockey team. The grand opening featured performances by Imagine Dragons, The Killers, and various other high-profile music acts.