Yellowstone National Park is a United States National Park and a UNESCO World Heritage Site. It was the world's first national park, set aside in 1872 to preserve the vast number of geysers, hot springs, and other thermal areas, as well as to protect the incredible wildlife and rugged beauty of the area. The park is principally contained within the northwest corner of Wyoming, but also extends into the states of Idaho and Montana.
We always say a picture is worth a thousand of words; however, pictures do not tell the whole beauty of the park. You need to put yourself there to feel the rumbling sound, heat and odors from geysers.
1: Old Faithful
2: Mud Volcano (steams coming out from Dragon's mouth geyser)