the Utah monolith enigma...

 https://www.deseret.com/u-s-world/2020/11/25/21719419/utah-monolith-explained-explainer-details-viewo-coordinates

A very nice 3 sided shaped pillar.

https://ksltv.com/449486/dps-crew-discovers-mysterious-monolith-from-air-in-remote-utah-wilderness/?

Of course what would be even more striking is if a rectangular shape showed up somewhere.

https://upload.wikimedia.org/wikipedia/en/5/53/African_monolith_2001.jpg

https://www.theothersideofmidnight.com/topic/anomalies

https://en.wikipedia.org/wiki/Utah#Geography_and_geology

https://en.wikipedia.org/wiki/Basin_and_Range_Province#Geology

https://en.wikipedia.org/wiki/Great_Basin

Of course deserts are full of various mysteries and artifacts.

https://en.wikipedia.org/wiki/Arches_National_Park

https://www.desertusa.com/north-american-deserts.html

https://www.standard.net/news/business/discovery-of-indian-artifacts-complicates-massive-desert-solar-project/article_dfbf37f6-223f-5030-8223-637b71c5164f.html

https://en.wikipedia.org/wiki/List_of_North_American_deserts

https://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Deserts_of_North_America.svg/533px-Deserts_of_North_America.svg.png

https://en.wikipedia.org/wiki/List_of_North_American_deserts#Full_listing

https://www.desertmuseum.org/books/nhsd_northamerica.php