America’s Oldest Drive-InShankweiler’s Drive-In Theatre has been running movies since 1934, making it the oldest operating drive-in theater in the United States. Pulling in during golden hour, when the sun is setting over the Pennsylvania hills, is its own kind of reward. Being outside in Pennsylvania in the summer means mosquitoes are part of the deal. Why It Belongs On Your Summer ListThere are plenty of things to do in Pennsylvania during summer. Put it on your summer list now, before the season slips away and you are left waiting for next year to finally make the trip.