Zoroaster Temple, Grand Canyon National Park, Arizona (© Nick Lake/Tandem Stills + Motion)

European beech forest in Belgium (© Philippe Moes/Minden Pictures)

Porto, Portugal (© Starcevic/Getty Images)

Strokkur geyser in Iceland (© John and Tina Reid/Getty Images)

Deer Valley at dusk, Park City, Utah (© Adventure_Photo/Getty Images)

Ad-Deir, Petra, Jordan (© Punnawit Suwuttananun/Getty Images)

Eurasian red squirrel (© Edwin Giesbers/Minden Pictures)

Martin Luther King Jr. Memorial in Washington, DC (© Win McNamee/Getty Images)

Neptune’s Grotto, Sardinia, Italy (© Carlo Murenu/Getty Images)

Sunset at White Sands National Park, New Mexico (© Image Professionals GmbH/Alamy)