Men face charges for walking on an old faithful geyser

YELLOWSTONE NATIONAL PARK, WY – SEPTEMBER 24, 2014: A sign announcing the National Parks Service greets visitors to Yellowstone National Park, Wyoming. (Photo by Robert Alexander / Getty Images)

Large Prismatic Spring at Midway Geyser Basin, Yellowstone National Park, Wyoming, United States

YELLOWSTONE NATIONAL PARK, WY – SEPTEMBER 25, 2014: A lodgepole pine leans toward the water on the bank of the Yellowstone River in Yellowstone National Park, Wyoming. (Photo by Robert Alexander / Getty Images)

YELLOWSTONE NATIONAL PARK, WY – SEPTEMBER 24, 2014: A cow moose stands in a clearing in the forest of Yellowstone National Park, Wyoming. According to the National Parks Service, there are fewer than 200 moose (Alces alces shirasi) in the park. (Photo by Robert Alexander / Getty Images)

Tower Falls Long Exposure in Yellowstone National Park, USA

YELLOWSTONE NATIONAL PARK, WY – SEPTEMBER 24, 2014: A bison grazes grasses in the Hayden Valley section of Yellowstone National Park, Wyoming. (Photo by Robert Alexander / Getty Images)

A child leans through the window of a moving car to photograph the wildlife of Yellowstone National Park, Wyoming, on June 7, 2013. Yellowstone National Park is the first national park in the world founded in 1872 and is at the top of the largest super volcano in North America. the caldera of Yellowstone. REUTERS / Jim Urquhart (USA – Tags: ENVIRONMENT)

YELLOWSTONE NATIONAL PARK, WY – JANUARY 21: Visitors explore the Mammoth Hot Springs travertine terraces in Yellowstone National Park as the government closes. Visitors are allowed to enter the park, with the understanding that there is no government service due to the closure of the government. (Photo by William Campbell / Corbis via Getty Images)

KEDIRI, EASTERN JAVA, INDONESIA – 2014/03/02: The new landscape of nature, created by the eruption of Mount Kelud, barren land and new ravines etched on the ground by lava. Four people were killed, dozens more injured and more than 100,000 people evacuated from villages in the Indonesian island of Java, after the eruption of Mount Kelud on February 13, 2014, emitting ash and lava 17 km in the air. Volcanic dust and sand have spread to almost every region of Java, resulting in the closure of three international airports in the region. The most dangerous consequence of the eruption of Mount Keluds will be the volcanic lava dust melt that will flow as soon as it begins to rain. Kelud is one of the most active volcanoes in the world and is ranked in the deadliest category in the book Super Volcano: The Time Bomb under Yellowstone National Park, written by Greg Breining. In the last 1000 years, it has erupted 30 times. The most serious eruption occurred in 1586, making between 10,000 and 15,000 people. An eruption in 1901 caused a lava flow up to 23 km from the volcano, swept through hundreds of villages and killed 5,160 people. Another eruption in 1966 killed about 2,000 people. (Photo by Arief Priyono / LightRocket via Getty Images)

Yellowstone National Park is a national park located primarily in the US state of Wyoming, although it also extends to Montana and Idaho.

EAST JAVA, INDONESIA – 2014/02/19: Residents witnessed the flood of volcanic ash and lava in the Konto River in Kandangan, Kediri. Four people were killed, dozens more injured and more than 100,000 people evacuated from villages in the Indonesian island of Java, after the eruption of Mount Kelud on February 13, 2014, emitting ash and lava 17 km in the air. Volcanic dust and sand have spread to almost every region of Java, resulting in the closure of three international airports in the region. The most dangerous consequence of the keluds eruption will be the volcanic lava dust melt which will flow when it starts to rain. Kelud is one of the most active volcanoes in the world and is ranked in the deadliest category in the book Super Volcano: The Time Bomb under Yellowstone National Park, written by Greg Breining. In the last 1000 years, it has erupted 30 times. The most serious eruption occurred in 1586, making between 10,000 and 15,000 people. An eruption in 1901 caused a lava flow up to 23 km from the volcano, swept through hundreds of villages and killed 5,160 people. Another eruption in 1966 killed about 2,000 people. (Photo by Arief Priyono / LightRocket via Getty Images)

Overlooking Mt. Washburn in Yellowstone National Park

A car takes a picture of the May 2011 route on the Sylvan Pass in Yellowstone National Park shortly after the park pass. Yellowstone will delay snow clearing this spring to meet the federal government's mandatory budget cuts. because of the sequestration. REUTERS / Ruffin Prevost (UNITED STATES – Tags: COMMERCIAL POLICY ENVIRONMENT)

YELLOWSTONE NATIONAL PARK, WY – JANUARY 21: Visitors explore the Mammoth Hot Springs travertine terraces in Yellowstone National Park as the government closes. Visitors are allowed to enter the park, with the understanding that there is no government service due to the closure of the government. (Photo by William Campbell / Corbis via Getty Images)

Fawn Fire at Yellowstone National Park, Wyoming, August 8, 2016. Image courtesy of Yellowstone National Park. (Photo via Smith Collection / Gado / Getty Images).

Castle Geyser is a cone geyser in Yellowstone. It is known for its large porous mineral deposit (sintered geyserite). It has a 10 to 12 hour eruption cycle that lasts about 20 minutes and reaches a height of 27 meters (90 feet).
Yellowstone National Park is the first national park in the United States. It is a UNESCO World Heritage Site.

Geyser Valley in the Norris Geyser Basin, Yellowstone National Park, Wyoming.

Upper Falls of the Yellowstone, Yellowstone National Park, Wyoming, United States of America.