Lake Retba, Senegal

Chalalan - Madidi National Park, Bolivia

Green hills in Sri Lanka

Bernina Express at highest point

Arenal, Costa Rica

The Springs Resort and Spa at Arenal, Costa Rica

Sunset on Westing beach, Unst, Shetland, UK

An ancient tree on the rim of Oregon's Crater Lake at twilight

Eagle Lake, near Lake Tahoe, California

Turquoise Pool, Chile

Great Falls, Virginia

Iguazu Falls, Argentina and Brazil

McKay Falls on California's Coast