Against the soaring backdrop of Arizona's Vermilion Cliffs, the 1929 Navajo Bridge, now used for foot traffic, crosses the Colorado River beside its 1995 counterpart.
Sulfur and algae turn hot springs into pools of living color. The water is condensation from hot gases rising from magma chambers. As the water evaporates, salts and minerals form a vivid crust.
The sweeping color of sea and sky, blue is a common thread in nature, seen in the cerulean of a whale shark (pictured here), the indigo of a stormy night, and the cobalt of a peacock's feathers. Over the centuries, the hue has come to represent calm, cold, mysticism, and sadness.
As startling as a bright-blue eye, a central lagoon peers out from Rocas Baimbridgen in Ecuador's Galápagos Islands. The stark, rocky island teems with life at times—the brackish lagoon waters are favored by flamingos.
The picture was taken at Eden Rock, Grand Cayman. For just a short time every year these silversides swarm caves and swim-throughs at Cayman's dive sites. The picture was taken late afternoon just as the sun was going down. I was hiding behind the silversides, low in the rocks. As the tarpon swam through the silversides, they eventually saw me and turned away. Just like you see in the picture.