Ambassador's Hall in the Alcázar of Seville, Spain (© Lucas Vallecillos/age fotostock)(Bing United States)

Ambassador's Hall in the Alcázar of Seville, Spain (© Lucas Vallecillos/age fotostock)(Bing United States)

View of Bacuit Bay from El Nido, Palawan, Philippines (© Alex Punker/Nimia)(Bing United States)

View of Bacuit Bay from El Nido, Palawan, Philippines (© Alex Punker/Nimia)(Bing United States)

Newly planted olive groves, Zaghouan, Tunisia (© Yann Arthus-Bertrand/Getty Images)(Bing United States)

Newly planted olive groves, Zaghouan, Tunisia (© Yann Arthus-Bertrand/Getty Images)(Bing United States)

Rosendale Trestle, Rosendale, New York (© Greg Miller/Gallery Stock)(Bing United States)

Rosendale Trestle, Rosendale, New York (© Greg Miller/Gallery Stock)(Bing United States)

Planetarium at the Bibliotheca Alexandrina, Alexandria, Egypt (© Paul Panayiotou/SIME/eStock Photo)(Bing United States)

Planetarium at the Bibliotheca Alexandrina, Alexandria, Egypt (© Paul Panayiotou/SIME/eStock Photo)(Bing United States)

Secretarybird hunting for food in Rietvlei Nature Reserve, South Africa (© Richard du Toit/Getty Images)(Bing United States)

Secretarybird hunting for food in Rietvlei Nature Reserve, South Africa (© Richard du Toit/Getty Images)(Bing United States)

New York City Veterans Day parade (© AP Photo/Julio Cortez)(Bing United States)

New York City Veterans Day parade (© AP Photo/Julio Cortez)(Bing United States)

Castle Trail in Badlands National Park, South Dakota (© Kirkendall-Spring Photographers/NPL/Minden Pictures)(Bing United States)

Castle Trail in Badlands National Park, South Dakota (© Kirkendall-Spring Photographers/NPL/Minden Pictures)(Bing United States)

Fish avoid a shark near Heron Island, Australia (© Scott Carr/REX/Shutterstock)(Bing United States)

Fish avoid a shark near Heron Island, Australia (© Scott Carr/REX/Shutterstock)(Bing United States)

Point Arena Light in California (© plainpicture/Westend61/Spotcatch)(Bing United States)

Point Arena Light in California (© plainpicture/Westend61/Spotcatch)(Bing United States)

Ferns in the Oregon side of the Columbia River Gorge (© Marc Adamus/Getty Images)(Bing United States)

Ferns in the Oregon side of the Columbia River Gorge (© Marc Adamus/Getty Images)(Bing United States)

Buda Castle seen from Gellért Hill in Budapest, Hungary (© Ionut David/Alamy)(Bing United States)

Buda Castle seen from Gellért Hill in Budapest, Hungary (© Ionut David/Alamy)(Bing United States)

The Foucault pendulum at the Griffith Observatory in Los Angeles (© GIPhotoStock/Science Photo Library)(Bing United States)

The Foucault pendulum at the Griffith Observatory in Los Angeles (© GIPhotoStock/Science Photo Library)(Bing United States)

Prusik Peak in the Enchantments, Alpine Lakes Wilderness, Washington (© Floris van Breugel/Minden Pictures)(Bing United States)

Prusik Peak in the Enchantments, Alpine Lakes Wilderness, Washington (© Floris van Breugel/Minden Pictures)(Bing United States)

Ta Prohm temple at Angkor, Cambodia (© Stefano Coltelli/Offset)(Bing United States)

Ta Prohm temple at Angkor, Cambodia (© Stefano Coltelli/Offset)(Bing United States)

Shanwangping Karst National Ecological Park outside Chongqing, China (© Chen Chao/Getty Images)(Bing United States)

Shanwangping Karst National Ecological Park outside Chongqing, China (© Chen Chao/Getty Images)(Bing United States)

Uummannaq, Greenland (© Gonzalo Azumendi/Getty Images)(Bing United States)

Uummannaq, Greenland (© Gonzalo Azumendi/Getty Images)(Bing United States)