Fortification Hill
Lake Mead National Recreation Area (map link) The folks at Geocaching.com like to have "challenges" from time to time. Usually, they just assign points to types of caches and if you get enough points, you get a souvenir. (There's a place on your profile to find these. It's not something meaningful.) Sometimes they get a little more intricate, like the one they had running when covid hit, Wonders of the World . In this one, they assigned "wonders" to geocaches randomly. There were two levels. You needed to find one each of the "modern wonders" to get the first souvenir. Then it was on to the "ancient wonders". When covid hit, the deadline became indefinite and then two more levels were added: "natural wonders" and "solar system wonders". I got through the first three levels by ignoring it until I found I had one to find, then making an effort to find that one. It took over a year to get through the third level si...