Yellowstone's lower (or southern) loop is one of the most amazing places on earth, with more geysers, hot springs and other thermal features than literally anywhere else on earth! Old Faithful, the world's most famous geyser, is there, as is another iconic sight, Grand Prismatic Spring! Talking of iconic, Yellowstone is known for its bison, and we'll do our best to get you stuck in one of our unforgettable bison jams!