The 'Tea Kettle,' boiling hot from Mother Earth’s hidden fires, Yellowstone Park, U.S.A.

The 'Tea Kettle,' boiling hot from Mother Earth’s hidden fires, Yellowstone Park, U.S.A.

Where Boiling River, still hot and steaming, meets the cool Gardiner in Yellowstone Park, U.S.A.

The 'Tea Kettle,' boiling hot from Mother Earth’s hidden fires, Yellowstone Park, U.S.A.

Fifteen-minute display of 'Riverside Geyser' – boiling water 100 feet in air – Yellowstone Park, U.S.A.

Fifteen-minute display of 'Riverside Geyser' – boiling water 100 feet in air – Yellowstone Park, U.S.A.

Fifteen-minute display of 'Riverside Geyser' – boiling water 100 feet in air – Yellowstone Park, U.S.A.

Grotesque shapes among the pools of 'Biscuit Basin,' Yellowstone Park, U.S.A.

Grotesque shapes among the pools of 'Biscuit Basin,' Yellowstone Park, U.S.A.

Grotesque shapes among the pools of 'Biscuit Basin,' Yellowstone Park, U.S.A.

The 'Black Warrior' Geyser waving a banner of steam spray, Yellowstone Park, U.S.A.

The 'Black Warrior' Geyser waving a banner of steam spray, Yellowstone Park, U.S.A.

The 'Black Warrior' Geyser waving a banner of steam spray, Yellowstone Park, U.S.A.

Great Mountain' Geyser, throwing up clouds of steam and boiling water, Yellowstone Park, U.S.A.

Great Mountain' Geyser, throwing up clouds of steam and boiling water, Yellowstone Park, U.S.A.

Great Mountain' Geyser, throwing up clouds of steam and boiling water, Yellowstone Park, U.S.A.

Grizzly Bear at home in the wooded wilderness of famous Yellowstone Park, U.S.A.

Grizzly Bear at home in the wooded wilderness of famous Yellowstone Park, U.S.A.

Grizzly Bear at home in the wooded wilderness of famous Yellowstone Park, U.S.A.

The Most famous sight in Yellowstone Park -'Old Faithful Geyser' in action.

The 'Devil's Inkwell' bubbling and boiling over hidden fires, in famous Yellowstone Park, U.S.A.

The 'Devil's Inkwell' bubbling and boiling over hidden fires, in famous Yellowstone Park, U.S.A.

The 'Devil's Inkwell' bubbling and boiling over hidden fires, in famous Yellowstone Park, U.S.A.

Where the Earth’s great fires are still unquenched – Black Pearl Geyser, Yellowstone Park, U.S.A.

Glittering spray from "Constant" Geyser, and steam from "Black Growler," Yellowstone Park, U.S.A.

Black Growler', whose steam kills trees, and whose roaring startles tourists, Yellowstone Park, U.S.A.

Glittering spray from 'Constant' Geyser, and steam from 'Black Growler,' Yellowstone Park, U.S.A.

Black Growler', whose steam kills trees, and whose roaring startles tourists, Yellowstone Park, U.S.A.

Black Growler', whose steam kills trees, and whose roaring startles tourists, Yellowstone Park, U.S.A.

Golden Gate, entrance to picturesque ravine of golden rocks - Yellowstone Park, U.S.A.