1. On February 3, 1923, the Copper Queen Mine in Ely, Nevada was struck by a devastating fire that killed seven mine workers. The fire raged for over two days before it was finally extinguished. This tragedy is still considered one of the worst mining disasters in Nevada history.

2. On February 3, 1932, the Boulder Dam, now known as the Hoover Dam, began generating power for the first time. The dam, located on the Arizona-Nevada border, was the largest concrete structure ever built at the time of its construction, and it still provides electricity to millions of people in the western United States.

3. February 3, 1948 marked the beginning of a historic strike by the United Mine Workers of America against the Anaconda Copper Mining Company in Yerington, Nevada. The strike lasted for over a year, and it was characterized by violence, intimidation, and political pressure on both sides.

4. On February 3, 1977, the iconic Stardust Hotel and Casino opened in Las Vegas, Nevada. The hotel, which was imploded in 2007, was known for its elaborate neon sign and its role in the development of modern Las Vegas.

5. February 3, 2005 saw the opening of the Mob Museum in downtown Las Vegas. The museum, which is housed in a former courthouse, explores the history of organized crime in the United States and its impact on American society. It is one of the most popular tourist attractions in Las Vegas.