USA
Arizona
Scenic wonders in northern Arizona include Red Rock Buttes, a Painted Desert, a Petrified Forest, a Mining Ghost Town and the Grand Canyon. In the south, the Sonoran Desert is home to endemic fauna and flora including the iconic Saguaro Cactus
Death Valley
The road to racetrack playa is notorious for eating tires. Safer to rent a high clearance offroader e.g. at Farabee's Jeeps. Best to track in to the Mesquite Dunes from Devil's Cornfield and bypass the tourist hordes.
Florida
Florida is at the intersection of the northern and southern ranges of many animals. Therefore the diversity is very high - especially during migration and winter months
Yellowstone
Fed by a super-volcano underneath, half of earth's hydrothermal features are found within Yellowstone NP. It has also the highest concentration of wildlife in the lower 48 states of the US