Gunpowder Valley — River Trails, Jerusalem Mill & the NCR Rail Trail

Barely thirty minutes north of downtown, Gunpowder Falls State Park protects a green ribbon of river valley that feels a world away from the city. This one-day loop pairs the cold, trout-rich Gunpowder River — where shaded footpaths trace the water beneath towering tulip poplars — with two of the park's set pieces: the restored 1772 Jerusalem Mill village, a living-history hamlet at the heart of the park, and the flat, tree-tunneled Northern Central Railroad Trail, a converted rail bed that runs dead-straight through the countryside toward the Pennsylvania line and is made for easy miles on foot or by bike. It's an active, low-effort day of riverside walking, historic wandering, and rail-trail rolling, capped by a meal in the horse-country hamlets of Monkton or Sparks.