1. On April 27, 1863, the Battle of Picacho Pass occurred, which was the westernmost battle of the American Civil War. Confederate scouts clashed with a Union cavalry unit, resulting in the deaths of three Confederates and one Union soldier.

2. In 1929, the iconic Wigwam Motel opened in Holbrook, Arizona, on Route 66. The motel features individual concrete teepees as guest rooms and has served as a popular tourist attraction for decades.

3. On April 27, 1969, astronaut Frank Borman, a Tucson native, returned to Earth after commanding the Apollo 8 spacecraft, which was the first manned mission to orbit the moon.

4. The Arizona Diamondbacks played their first game at Bank One Ballpark (now Chase Field) on April 27, 1998. The team defeated the Colorado Rockies 9-2 in front of a sold-out crowd.

5. In 2011, an EF2 tornado struck the town of Cave Creek, Arizona, on April 27, causing damage to homes and businesses. It was the first tornado to hit the Phoenix metropolitan area since record-keeping began in 1950.