This 1901 US "Indian Head" penny remains uncirculated because it was encased in a "lucky charm," turning it into a pendant. It advertised Henry J. Wehr's "The Empire," described as a "sample room and restaurant" in Milwaukee, Wisconsin.
Just a few years before this charm was made, aluminum was very expensive and called "silver clay." It was then mostly used for jewelry and at one time was more expensive than gold. Two important public monuments of the time were made of aluminum. Do you know what they were?