Jacob's Well, just outside of Austin. It is one of the longest underwater caves in Texas and an artesian spring.
Kayaking in Emerald Cave, Colorado River in Black Canyon, Arizona, USA
Winter, Coffee Pot Rock, Sedona, Arizona, United States.
"The Eruption" (blazing sunset reflects in calm waters, Half Dome, Yosemite National Park, California) ~ Photo by Mark Cote
The Eruption by Mark Cote | 500px
Douro River in northern Portugal