The Denver Museum of Nature & Science is home to what's widely considered the best, if not the biggest, rhodochrosite specimen in the world. Discovered in 1992 in the Sweet Home Mine, a former silver mine near the town of Alma, the impressive block of nearly transparent, cherry-red crystal is called the Alma King. And if its regal name isn't enough to entice you to go see it, consider how one museum geologist describes it: "It reminds me of a giant piece of candy. It makes you want to go up and lick it." Sadly, you can't, because the Alma King is kept behind glass and away from visitors' tongues.