This stack of rocks on private property in West Texas is known as a "water monument." High upon a hill sits this 8-foot tall stack of rocks for the pu

Cool! I love history lessons about the ingenuity of those who came before us. They actually still mark some trails like this, too--out in Moab, UT, some of the routes over the "slickrock" are marked with "cairns"--little piles of rocks widely spaced apart.