1. On May 12, 1902, the city of Wallace, Idaho was devastated by a massive fire that burned down much of the town. The fire destroyed over 200 buildings and left over 3,000 people homeless.

2. May 12, 1918 marked the beginning of the deadliest forest fire in Idaho's history. Known as the "Big Burn," the fire burned over 3 million acres of forest and killed 87 people.

3. Idaho's first territorial governor, William H. Wallace, was sworn into office on May 12, 1863. Wallace went on to serve as governor for four years and was instrumental in helping Idaho become a state in 1890.

4. On May 12, 1928, the first commercial flight landed in Boise, Idaho. The flight was operated by Varney Airlines (which later became United Airlines) and marked the beginning of regular commercial air service in the state.

5. May 12, 1956 was a historic day for skiing in Idaho, as Sun Valley Resort became the first ski resort in the world to install a chairlift. The lift, named "Cold Springs," carried skiers up Bald Mountain for the first time, revolutionizing the sport of skiing and making Sun Valley a world-famous destination for winter sports enthusiasts.