1. In 1868, the city of Reno was officially founded in Nevada on June 20. Originally named Lake's Crossing, the city was renamed after Civil War general Jesse L. Reno.

2. The Nevada State Museum in Carson City opened its doors to the public on June 20, 1941. The museum is home to a diverse collection of artifacts related to the history and culture of Nevada, ranging from fossils to silver mining exhibits.

3. On June 20, 1958, the Jerry Lewis and Tony Curtis comedy film "The Big Circus" had its world premiere in Las Vegas, Nevada. The film, which was shot in part at the Circus Circus casino, was a box office hit and is now considered a classic of the genre.

4. In 2003, Nevada became the first state in the United States to legalize and regulate online poker. The law was signed by Governor Kenny Guinn on June 20 of that year, and allowed for the creation of licensed online poker operators within the state.

5. Nevada is home to the Hoover Dam, one of the most iconic engineering marvels in the world. Construction on the dam began on June 20, 1931, and was completed in 1936. The dam, which spans the Colorado River between Arizona and Nevada, generates electricity and helps to regulate water flow in the western United States.