Casa Batlló in Barcelona, Catalonia, Spain (© Marco Arduino/Sime/eStock Photo)

Mississippi River on the border between Arkansas and Mississippi (© NASA)

The north coast of Madeira, Portugal (© Hemis/Alamy)

Tegallalang Rice Terraces, Ubud, Bali, Indonesia (© Michele Falzone/Alamy)

Large school of Munk's devil rays seen from the air, Gulf of California, Mexico (© Mark Carwardine/Minden Pictures)

Montalbano Elicona, Messina, Sicily, Italy (© Antonino Bartuccio/SOPA Collection/Offset by Shutterstock)

New River Gorge Bridge in the New River Gorge National Park and Preserve, West Virginia (© Entropy Workshop/iStock/Getty Images Plus)