Umpqua hot springs | North of Crater Lake Oregon, USA
Hot springs in the snow... Cottonwood Hot Springs, west of Buena Vista Colorado
The Glory Hole in Ozark National Forest, Arkansas, USA...
Amazing Texas Swimming Holes. great list. Only 2 more to check out from this list.
List of waterfalls and swimming holes in Utah
8 lesser-known, beautiful camping spots in the western U.S. with recommended hikes & travel info.
Best Lake Camping in Washington - all lake side camp spots
Sand Cave in Cumberland Gap National Park
Starved Rock State Park, Illinois.
Path tunnel in Old Mans Cave gorge in Hocking Hills State Park. In Ohio