National Museum Day: 20 most-visited museums in the USA

May 18th is National Museum Day, so what better way to celebrate than highlighting the ones most visited in America? Though the name of the Themed Entertainment Association (TEA) implies more of a focus on theme parks (including their list of the 20 most visited theme parks in North America) it also includes visitor information for the 20 most visited museums. Which is the most popular museum in the USA? Click through the gallery to see, along with how many visitors each had (note: the latest available data is from 2015). Then check out the list of most visited theme parks below: