Mars

Cecropia leaf atop lobster claw petals, Mexico

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

Monks Mound at the Cahokia Mounds UNESCO World Heritage Site near Collinsville, Illinois

Cranberry bog

Sunflower

Red fox in Amsterdamse Waterleidingduinen Nature Reserve, Netherlands

Ahmad Bin Ali Stadium in Doha, Qatar

'World in Progress II,' a land art painting by Saype, United Nations Headquarters, New York City

Virgin River in Zion National Park, Utah

The gates of the Royal Palace (Dar al-Makhzen) in Fez, Morocco

Bridge on the McKenzie River Trail, Willamette National Forest, Oregon

Cliff dwellings in Mesa Verde National Park, Colorado

North American river otters swimming in Acadia National Park, Maine

Ruins of the medieval castle of the Knights of St. John above the village of Chorio, Halki Island, Greece

The Punch Bowl on the River Quoich in the Cairngorms, Aberdeenshire, Scotland

Bald eagles near Haines, Alaska

The Vietnam Women's Memorial in Washington, DC

Rock formations in Badlands National Park during a lightning storm, South Dakota

European hedgehog in Sussex, England