Tourists and conservation volunteers relaxing and reading in hammocks in a lodge in the Amazon rainforest. South Australia blue-gum trees A rainbow rises out of

A rainbow rises out of the ocean near a boulder-strewn shoreline

A rugged cliff face and pinnacle rock near a volcanic caldera

A veteran Antarctic glaciologist's weathered features and white beard

A water bearer walks up the long stairway of a Jain temple

Winter dew drops and fog over a farm field and dry grasses at dawn

Tourists and conservation volunteers relaxing and reading in hammocks in a lodge in the Amazon rainforest. South Australia blue-gum trees A rainbow rises out ofTourists and conservation volunteers relaxing and reading in hammocks in a lodge in the Amazon rainforest. Amazon Basin, Loreto Region, Maynas Province, Peru.