1. On April 11, 1980, the iconic Arizona Biltmore Hotel was added to the National Register of Historic Places. The hotel, located in Phoenix, was designed by famous architect Frank Lloyd Wright and has hosted numerous celebrities and political figures over the years.

2. In 1912, Arizona's statehood was recognized by President William Howard Taft, making it the 48th state to join the Union. April 11 is celebrated as Arizona Statehood Day every year.

3. On April 11, 1871, the first U.S. Assay Office in Arizona was established in Tucson. The office was responsible for testing and verifying the purity of gold and silver deposits throughout the state.

4. In 1968, the Phoenix Zoo officially opened to the public on April 11. The zoo is now home to over 3,000 animals from around the world and is a popular attraction for tourists and locals alike.

5. On April 11, 1882, the town of Bisbee was founded. The town, located in southern Arizona, was an important center for copper mining in the early 20th century and played a key role in Arizona's economic development. Today, Bisbee is known for its historic architecture and artistic community.