Your breath quickens as you stand atop the Empire State Building. Over a thousand feet below you, the ground appears to spin. Amazing! Structures introduces some of the most awe-inspiring, man-made creations in the world. SpectrumÂ® Readers are the perfect Common Core aligned tool to support the development of nonfiction reading skills crucial to a young readerâ€™s success. Each leveled reader features high-interest informational content, exciting full-color photo illustrations and Common Core aligned comprehension practice focused on the development of critical thinking skills. This multilevel series is the perfect addition to any library at school or home.