For those with an interest in historical US maps, this site will be of value. The Library of Congress has recently added to its American Memory Collections a small preview set of 19th and early 20th century panoramic maps, also known as birds-eye view maps. These are "nonphotographic representations of cities portrayed as if viewed from above at an oblique angle," and, though not drawn to scale, "show street patterns, individual buildings, and major landscape features in perspective." At present, over forty city maps are available from five states, with additional maps scheduled to be added over time. Maps are arranged by geography, subject (place), and keyword (place or creator). Users can change the window size of the image and zoom in or out anywhere on the map, allowing for detailed views of these artworks. Note that heavy traffic at the LOC site may restrict availability at times.