Yellowstone National Park
Mammoth Hot Springs - Liberty Cap : 37-foot (11-m) hot spring cone. Its unusual formation was created by a hot spring whose plumbing remained open and in one location for a long time. Its internal pressure was sufficient to raise the water to a great height, allowing mineral deposits to build continuously for perhaps hundreds of years.
NIKON CORPORATION NIKON D90, f/4.8 @ 40 mm, 1/400, ISO 200, No Flash
© Evan Avidon