Mammoth Campground at Yellowstone National Park, Wyoming, United States. Mammoth sign.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States. Firewood building.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.

Mammoth Campground at Yellowstone National Park, Wyoming, United States.