"Subway" Zion National Park, UT By Robert Park http://www.robert-park.com, a photo by Robert Park Photography on Flickr.
It is a very strenuous and slippery nine mile round trip that few people ever get to see.
The pools get their color from the algae that thrive in the cold water that never sees sunlight
For most of the year.
Location The Subway, Zion National Park, UT. © Robert Park www.robert-park.com