The official start of summer may be June 21, but Memorial Day weekend is the unofficial kickoff to the season.
In 1971, United States Congress declared Memorial Day a national holiday, and scheduled it on the last Monday in May.
Check out the slideshow, above, for the most popular destinations in the U.S. this Memorial Day weekend, according to data on hotel bookings from Expedia.
Expedia also analyzed flight data, which produced slightly different results for the most popular cities. By flight, the 10 most popular destinations were — in order — New York, Las Vegas, Los Angeles, Boston, Chicago, San Francisco, Orlando, Washington D.C., Seattle and Atlanta.
Are you visiting one of the top destinations this holiday weekend?