Went on a hike today here in Nevada.  We went to Red Rock National Park.  The particular trail we decided to do was the Calico Tanks, from the Sandstone Quarry turn-off.  It's rated "moderate", but this hike pretty much kicked our asses.  There was a number of places where you had to scramble up some huge rock formations.
Anyway, there is a bit of a payoff at the end of the hike.  There's a pool created on the sandstone from a combination of precipitation and springs.  Apparently even in the midst of summer there's always some water there.  There's also a pretty impressive view of the Las Vegas valley on the other side of the pool.