COME SUMMER, my family enjoys lighthouse hopping. Like hikers who “bag” mountain peaks, we “collect” lighthouses. They’re America’s castles, harboring stories of sunken ships, Revolutionary battles, desperate drownings, daring rescues, and keepers’ isolated lives. Climb up spiraling stairs and a steep ladder and through a tight hatch into the lamp room and claim your reward: a breathtaking 360-degree view. Navigation technology has rendered lighthouses mostly obsolete. Yet many mariners still look to them to negotiate New England’s rocky coastline, and they attract tourists from around the world. Here are 10 for you to collect this summer.