04-10Grizzly bear cub siblings playing in Denali National Park and Preserve, Alaska - Ron Niebrugge/Alamy)
04-09Square Tower Group in Hovenweep National Monument, Utah - Brad McGinley Photography/Getty Images)
04-05Saut du Brot stone bridge in the Areuse Gorge, Neuchâtel, Switzerland - Andreas Gerth/eStock Photo)
04-03Lighthouse at Cape Aniva, Sakhalin Island, Russia - Amazing Aerial Agency/Offset by Shutterstock)
04-02Lençóis Maranhenses National Park in the state of Maranhão, Brazil - WIN-Initiative/Getty Images)