Đurđevića Tara Bridge in Montenegro

Crater glow from Mount Mayon in the Philippines

Underground lake in Ruskeala Mountain Park, Karelia, Russia

Red-billed oxpeckers on an impala in Mpumalanga, South Africa

Casa do Penedo (House of the Rock) in Portugal

A sea swallow feeding on the tentacles of a blue button in Coffs Harbour, New South Wales, Australia

Peekaboo view of Angels Window on the North Rim of the Grand Canyon, Arizona

Old surfboards lined up as a fence near Paia, Maui, Hawaii

Little blue heron in Cuba

The shoreline of Olympic Coast National Marine Sanctuary, Washington state

Petit Minou Lighthouse in the roadstead of Brest, Finistère, France

Rub' al Khali desert on the border of Oman and the Emirate of Dubai

Giant manta ray and a photographer off the Ningaloo Coast, Australia

The Old Town of Dubrovnik, Croatia

Stairway to Heaven trail in Wawayanda State Park, New Jersey

Silhouette of Shambhala roller coaster at sunset in PortAventura Park, Salou, Tarragona, Spain

Strandbad Tiefenbrunnen, a public pool on the shore of Lake Zürich, Switzerland

Ubehebe Crater in Death Valley National Park, California

Horned ghost crab, Grand Anse, Praslin Island, Seychelles

African bush elephant herd, Okavango Delta, Botswana