Ash Meadows National Wildlife Refuge

Ash Meadows is the improbable oasis 90 minutes northwest of Las Vegas: 23,000 acres of Mojave desert where fossil water surfaces in startlingly blue spring pools, holding the greatest concentration of endemic species anywhere in the United States — more than 26 plants and animals found nowhere else on Earth, most famously the Amargosa pupfish. Three ADA-accessible boardwalks (Crystal Spring, Point of Rocks to Kings Pool, and Longstreet Spring with its 1890s cabin) loop past the pools, and the free visitor center adds exhibits, a 19-minute film and a picnic area. Entry costs nothing — it's a US Fish & Wildlife refuge with no fee and no permit.

Come prepared for genuine remoteness: no food, no gas and patchy cell service past the highway turn-off, gravel interior roads that a normal car handles in dry weather, and 110°F-plus summers when the wildlife hides — spring and fall mornings are the season, with spring bird migration the peak (300-plus species pass through). Swimming in the spring pools is strictly forbidden — they're endangered-fish habitat — and Devils Hole, the fenced geothermal cavern at the refuge's edge, is actually a detached unit of Death Valley National Park: home of the Devils Hole pupfish, viewable only from an overlook. Pair the trip with Death Valley next door and it's one of the great quiet days within reach of the Strip.