Boulder City Historic District - Credit: Wikimedia Commons
Boulder City Historic District, is Nevada's largest listing on the National Register of Historic Places with 514 buildings. Among the buildings, 408 constructions were built during the first 11 years (from 1931 to 1942). Between World War II and 1950, 66 buildings were built; the rest 40 were constructed after 1950. Read more on Wikipedia
Source: en.wikipedia.org