Fort Popham looks impressive from the outside, but the real adventure starts once you step inside. This historic Civil War-era fort is packed with winding stone halls, towering brick archways… and some of the darkest rooms you’ll ever experience, like, ever. The light from the entrance disappears within a few steps, leaving you surrounded by cool stone walls and total darkness. Once you’ve finished exploring the fort, you’re only minutes away from Popham Beach, where you can spend the rest of the day by the ocean. You probably won’t need it anywhere else… but at Fort Popham, you’ll be glad you did.