In general, along the bayshore and valleys, the Ohlone constructed dome-shaped houses of woven or bundled mats of tules, 6 to 20 feet (1.8 to 6 m) in diameter. In hills where redwood trees were accessible, they built conical houses from redwood bark attached to a frame of wood. Residents of Monterey recall Redwood houses. One of the main village buildings, the sweat lodge was low into the ground, its walls made of earth and roof of earth and brush. They built boats of tule to navigate on the bays propelled by double-bladed paddles.