Yellowstone Nat'l Park

Only 3% of Yellowstone National Park resides in Montana, but the state is home to three of the park's five entrances. Near the north entrance of the park, you'll find Mammoth Hot Springs, which has been said to look like a cave that's been turned inside out. If you decide to enter through the west entrance, located just across the Wyoming and Idaho borders in West Yellowstone, you'll be a quick drive away from several geyser basins, which include both geysers and hot springs.