03-21Bluebell flowers carpet the Hallerbos forest floor, Flanders, Belgium - Jason Langley/plainpicture)
03-19Aerial view of the City of Adelaide shipwreck with trees growing on it, Magnetic Island, Queensland, Australia - Amazing Aerial Agency/Offset by Shutterstock)
03-15Screech owl resting in a tree cavity, Massapequa Preserve, Long Island, New York - Vicki Jauron, Babylon and Beyond Photography/Getty Images)
03-12A balloon flies over the Pyramid of the Sun at sunrise in Teotihuacan, Mexico - Marco Ugarte/AP Photo)