The Most famous site in Yellowstone Park – "Old Faithful" Geyser in action (180 ft. high).

Peering into the mysterious crater of 'Old Faithful,' between its eruptions, Yellowstone Park, U.S.A.

Peering into the mysterious crater of 'Old Faithful,' between its eruptions, Yellowstone Park, U.S.A.

Peering into the mysterious crater of 'Old Faithful,' between its eruptions, Yellowstone Park, U.S.A.

Sunrise in Yellowstone Park, where the Earth’s fires still burn – N. E. over Upper Geyser Basin.

Sunrise in Yellowstone Park, where the Earth’s fires still burn – N. E. over Upper Geyser Basin.

Sunrise in Yellowstone Park, where the Earth’s fires still burn – N. E. over Upper Geyser Basin.

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.

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.

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.