The Herbarium associated with the Denver Botanical Gardens has an excellent specimen collection related to the plant diversity of Colorado and the Southern Rocky Mountain region. And that’s not the best thing about it.
It also has one of the few actively curated ethnobotany collections in the U.S. One of the items reported was the widespread use of plants in the Cedar/Juniper family by dozens of Native American tribes for things like as a talisman to help protect against evil spirits, medicine, fuel and dyes. And although I love this kind of stuff, it’s still not the best part.