Modern commemorative coins are special editions produced to celebrate significant events, individuals, or themes. The 2017 Denver 50-cent piece is a modern commemorative coin from the United States, released as part of a series recognizing historical milestones. These coins are typically minted in limited quantities and often carry distinctive designs that reflect their commemorative nature, making them sought after by collectors. The 50-cent denomination allows for detailed artistry and is a popular choice for such commemorative issues.