Keppler Cascade, one of the Gems of Yellowstone Park, U.S.A.

Keppler Cascade, one of the Gems of Yellowstone Park, U.S.A.

Ominous Bubbling and boiling in the 'Devil's Punch Bowl,' Yellowstone Park, U.S.A.

Ominous Bubbling and boiling in the 'Devil's Punch Bowl,' Yellowstone Park, U.S.A.

Ominous Bubbling and boiling in the 'Devil's Punch Bowl,' Yellowstone Park, U.S.A.

Mirrored beauty of majestic 'Old Faithful,' east to Continental Divide, Yellowstone Park, U.S.A.

Mirrored beauty of majestic 'Old Faithful,' east to Continental Divide, Yellowstone Park, U.S.A.

Mirrored beauty of majestic 'Old Faithful,' east to Continental Divide, Yellowstone Park, U.S.A.

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

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

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

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.

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.