Borovets, Bulgaria

Great horned owls and a gilded flicker on a saguaro cactus in the Sonoran Desert, Arizona

Hallstatt, Austria

Poinsettia plants

Tangle Creek Falls in Jasper National Park, Alberta, Canada

Salar de Uyuni in Bolivia

Muskox mother and calf in Dovre-Sunndalsfjella National Park, Norway

The Cathedral of Florence, Italy

Mokoli'I Island in Kaneohe Bay, seen from Kualoa Regional Park, Oahu, Hawaii

A great egret in Everglades National Park, Florida

Saint Nicholas Day in Verbier, Switzerland

Elephants near Mount Kilimanjaro, Amboseli National Park, Kenya

Miami Beach, Florida

Tlikakila River Delta in Lake Clark National Park, Alaska

Paradise Harbour, Antarctica

The Old Town of Rovinj, Croatia

Great blue herons building a nest in Wakodahatchee Wetlands, Delray Beach, Florida

Mars

Cecropia leaf atop lobster claw petals, Mexico

An olive tree in front of the Temple of Concordia on the island of Sicily, Italy