The United States has an estimated 250,000 courts to accommodate 28 million Americans who play tennis, according to the United States Tennis Association’s latest statistics. Even in such a big and sprawling country, a few of those courts are going to end up in unusual places.

So you shouldn’t be surprised to find one tucked into Grand Central Terminal, or overlooking Alcatraz. You can stumble on a clay court hidden amid apartment complexes in Brooklyn. Or one carved out of a family farm in Iowa. That one’s a grass court, naturally.

You can give tennis a try at the same courts as the Williams sisters did or at the International Tennis Hall of Fame. Or next to an oil field in Texas or on the shores of Lake George.And you can play them without breaking the bank. Most of the courts featured here are open to the public.