Carlsbad Caverns National Park in New Mexico is a wonderful place to explore the world below. The unique caverns were formed over 4 million years ago by sulfuric acid dissolving limestone – creating long tunnels and amazing rock formations. Take a self guided tour of the Big Room or embrace adventure and follow a ranger into the deep, dark, tight recesses of this fascinating park. Photo courtesy of Aaron Bates.
Yellowstone National Park – Wyoming – USA (by Henrik Johansson)
New York City – New York – USA (by Thomas Richter)
The snowiest place in Oregon, Crater Lake National Park’s winter blanket glows in the fading light of a purple sunset. Despite the frosty atmosphere, the lake rarely freezes. The last complete freeze was in 1949. Photo by John Dale (http://ift.tt/18oFfjl).
New York City – New York – USA (by Sergey Galyonkin)
San Francisco – California – USA (by Emmanuel DYAN)
San Francisco’s iconic Golden Gate Bridge stretches into a sea of fog, as seen from a helicopter. California’s Golden Gate National Recreation Area, which borders the bridge, is just as stunning at ground level. To the west, Kirby Cove features fantastic views and camping, while Fort Baker to the east offers crabbing, kayaking and hiking near a historic U.S. Army post. Sunset photo courtesy of Engel Ching.
Yosemite National Park – California – USA (by clayirving)
New York City – New York – USA (by Thomas Richter)
Winter has come to Lake Clark National Park & Preserve in Alaska and left it wrapped in white and blue. Besides water and sky, every feature is coated with snow and frost – obscured by a wispy fog and lingering clouds. It’s peaceful, beautiful and cold enough to make your teeth chatter. Photo by J. Mills, National Park Service.
Sig Nordal 