Get into a museum without getting out your wallet on Sept. 21 thanks to Smithsonian magazine’s Museum Day.

The annual event, now in its 15th year, gives people tickets for free admission to one of 1,300-plus museums and cultural institutions across the country.

Admission is always free at Smithsonian museums in Washington, D.C. — and some of the Museum Day venues outside the nation’s capital. But ticket holders will be able to enjoy that same privilege at places that typically charge an entry fee, such as the Newseum in D.C.; the American Space Museum in Titusville, Fla.; the Grammy Museum in Los Angeles and the Museum of Pop Culture in Seattle.

Go to the website to see a list of all the participating venues, categorized by location and area of interest. That’s where you can download your ticket, which covers the cost of general admission for two people.

Choose wisely. Only one ticket is allowed per email address.

Some of the savings are pretty substantial. Ticketholders can save $52 — the price of two adult admission tickets — at the Pro Football Hall of Fame in Canton, Ohio, for example.

Here’s a small sampling of other spots taking part in the program:

  • Celebrate all things canine at the AKC Museum of the Dog. The American Kennel Club institution got a new dog house earlier this year when it moved into new digs in Manhattan.
  • Take up some space at Chicago’s Adler Planetarium, or head to the state’s capital to learn more about a past POTUS at the Abraham Lincoln Presidential Library and Museum in Springfield.
  • Spend some free time outdoors at the Key West Tropical Forest & Botanical Garden at the tip of the Florida Keys, the Tucson Botanical Gardens in Arizona or the Lady Bird Johnson Wildflower Center in Austin, Texas.
  • Swing through downtown Louisville, Ky., to see how baseball bats come to be at the Louisville Slugger Museum & Factory.