Solar Impulse 2 flying over the pyramids in Giza, Egypt

Källö-Knippla, an island in the archipelago of Gothenburg, Sweden

Freshwater plants and tetra fish, Aquário Natural, Rio Baía Bonita, Mato Grosso do Sul, Brazil

The Great White Roller Coaster at Wildwood, New Jersey

Chittorgarh Fort, India

Panther chameleon in Amber Mountain National Park, Madagascar

Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota

Herd of African elephants in Amboseli National Park, Kenya

Mount Tsubakuro near Azumino, Nagano, Japan

Joshua trees in Joshua Tree National Park, California

Cueva de las Manos (Cave of the Hands) in Santa Cruz, Argentina

Aerial view of the island Pantaleu near Sant Elm, Mallorca, Spain

Spring Point Ledge Light in South Portland, Maine

Salt flats in San Francisco Bay

Edinburgh city skyline at night, Scotland

Farmers collecting water lilies in the Satla marshland near Bagdha, Barisal, Bangladesh

Red-necked grebes in Germany

The Hickman Bridge at Capitol Reef National Park, Utah

An active lava tube, Hawai'i Volcanoes National Park, Hawaii

Noctilucent clouds in Lithuania