Grand Prismatic Spring, Yellowstone National Park

 INTRODUCTION:Midway Geyser Basin contains a small collection of mammoth-sized springs. Midway is part of the Lower Geyser Basin, but because of its isolated location between the main features of Lower and Upper geyser basins it became known as Midway.Image|Link

 GET IN: Rudyard Kipling, who visited Yellowstone in 1889, immortalized this basin by referring to it as "Hell's Half Acre." Even today it is still remembered by that name. Despite its small size Midway possesses two of the largest hot springs in the world. Grand Prismatic Spring, nearly 370 feet in diameter, sits upon a large mound surrounded by small step-like terraces.Image|Link

 The other feature, Excelsior Geyser, erupted nearly 300 feet high before the 1900s.Image|Link