The Hidden Valley was a favourite place for cattle rustlers in the 19th century - well concealed and green. The present entrance to the valley was blasted by a prospector and appears suddenly around a bend in the trail. A nice panorama at the DesertUSA site.
A large ( read old ) Joshua Tree, Joshua Trees are not trees, they are lilies. They do not have age rings. Hence the only way to age a Joshua Tree is to carbon-date it. A rough idea can be made from the height and number of branches too.
Wildflower blooms - we went at a time between low desert flower carpets and high desert flower carpets. While we didn't get to see any flower carpets, we saw virtually all kinds of flowers.
Yucca bloom hiding the desert sun. Since the Mojave is a high altitude desert, we really didnt feel the heat of the sun that much - but got heavily tanned.
The perfect lair for a cougar or a bobcat. Even has decorative flower clumps in front. ( I sound like a real estate agent ) Unfortunately, we did not see any large mammals except for one coyote crossing the road.