On a beautiful Berkshires summer morning, Knesset Israel's Rabbi David Weiner enjoys little more than a hike. Join him for some Torah, good company, and a hike through the Keystone Arch Bridges of Chester and Middlefield, along the lovely out-and-back trail alongside the first railroad to cross the Berkshires. The river burbles, the cascades impress, and the handmade rock cuts and ingenious keystone bridges are models of not-quite-modern engineering. A low intensity hike with a spot to wade in the cool river.