Denver has one of two US mint sites that are open for public tours. The tour requires advance reservations although a limited first come, first serve slots may be available. Cameras are not allowed inside.
This is one of the three US Mints in the US where all of the US Currency is minted (the other mints are located in Philadelphia, PA and San Francisco, CA). Tours are conducted Monday through Friday from 8:00am to 4:00pm. Specific tour times cannot be requested. Certain items are prohibited. A list of these items are on the website listed below.
You can tour the US Mint, where they make coins and commemorative coins.
It was established in 1906 as a branch for the United States, where coin presses make coins of various sizes for release to the American public. The raw gold and silver mostly came fro the nearby Cripple Creek mining district.