Mokoli’I Island in Kaneohe Bay, seen from Kualoa Regional Park, Oahu, Hawaii (© Riddhish Chakraborty/Getty Images)

A great egret in Everglades National Park, Florida (© Troy Harrison/Getty Images)

Saint Nicholas Day in Verbier, Switzerland (© Denis Balibouse/Reuters)

Elephants near Mount Kilimanjaro, Amboseli National Park, Kenya (© Diana Robinson Photography/Getty Images)

Miami Beach, Florida (© Matteo Colombo/Getty Images)

Tlikakila River Delta in Lake Clark National Park, Alaska (© Dawn Wilson Photography/Getty Images)

Paradise Harbour, Antarctica (© SinghaphanAllB/Getty Images)

The Old Town of Rovinj, Croatia (© trabantos/Shutterstock)

Great blue herons building a nest in Wakodahatchee Wetlands, Delray Beach, Florida (© Imagebroker/Alamy)

Mars (© NASA/Alamy)