Medina of Tétouan, Morocco (© Jan Wlodarczyk/eStock Photo)

The Roaches, Peak District, England (© George W Johnson/Getty Images)

A meerkat in Namibia (© Danita Delimont/Offset by Shutterstock)

Wakatobi National Park, Indonesia (© Fabio Lamanna/Alamy)

Lake Schrecksee, Allgäu Alps, Bavaria, Germany (© Andreas Hagspiel/EyeEm/Getty Images)

Serra da Malagueta mountains, Santiago island, Cabo Verde (© Samuel Borges Photography/Shutterstock)

Tawny frogmouth chick, Australia (© SnapRapid/Offset by Shutterstock)

Kazem Dashi, Lake Urmia, Iran (© Ali/Adobe Stock)

Appalachian Trail, Stokes State Forest, New Jersey, USA (© Frank DeBonis/Getty Images)

Island of Ortygia, Syracuse, Sicily, Italy (© DaLiu/Shutterstock)

Milky Way over the Tagus river, Monfragüe National Park, Spain (© Miguel Angel Muñoz Ruiz/Cavan Images)

Spiral aloe (© David Madison/Getty Images)

Lighthouse of Felgueiras, Porto, Portugal (© Stephan Zirwes/Offset by Shutterstock)

Pink fringed tulip, Ottawa, Canada (© colimachon/Getty Images)

A bluethroat singing in a field (© Zwilling330/iStock/Getty Images Plus)

Ngo Dong river, Ninh Binh province, Vietnam (© Jeremy Woodhouse/Getty Images)

Mont Choisy Beach, Mauritius (© Robert Harding World Imagery/Offset by Shutterstock)

Loepa oberthuri moth (© Robert Thompson/Minden Pictures)

Pink salt lake, Gruissan, France (© Abstract Aerial Art/Getty Images)

Composite image of the Moon (© Prathamesh Jaju)

Vermilion Lakes, Canadian Rocky Mountains (© Glowing Earth Photography/Getty Images)

Minokake-Iwa rocks, Izu Peninsula, Japan (© Krzysztof Baranowski/Getty Images)

Tokyo Tower, Minato City, Tokyo, Japan (© Yukinori Hasumi/Getty Images)

Sea goldies, Great Barrier Reef, Queensland, Australia (© Gary Bell/Minden Pictures)

City Palace, Udaipur, India (© Chaiyun Damkaew/Getty Images)

Mangrove trees, Walakiri Beach, Sumba island, Indonesia (© Tengguo Wu/Getty Images)

Adler Planetarium, Chicago, Illinois, USA (© Amazing Aerial Agency/Offset by Shutterstock)

Zinnowitz pier, Usedom island, Germany (© Frank Günther/Getty Images)

Tiger in Assam, India (© Sandesh Kadur/Minden Pictures)

Otter Cliffs, Acadia National Park, Maine, USA (© dbimages/Alamy)

Northern carmine and European bee-eaters in Mkomazi National Park, Tanzania (© webguzs/Getty Images)