Giant sequoias thrive at Case Mountain in California. Three small groves – which have never been logged – protect majestic trees that are 6-16 feet in diameter! These groves are part of the Case Mountain Extensive Recreation Management Area that has miles of mountain bike, foot and equestrian trails, and endless opportunities to be wowed! Photo by Bob Wick, BLM

Ten years ago, Augustine volcano in Alaska swelled, rumbled and erupted. A gigantic cloud of ash rose above the mountain and two lava flows crawled down its sides. The eruption resulted in ash fall throughout south-central Alaska and disrupted air traffic over the state. Historically, Augustine volcano has been the most active volcano in Alaska’s Cook Inlet region with recent eruptions in 1976, 1986 and 2006. Photo by Cyrus Read, @usgs. #tbt