Logging became a principal early industry, with sawmills established using water power from the Pemigewasset River. The entrance of the railroad in the 19th century opened the wilderness to development, carrying away wood products to market. It also brought tourists, many attracted by paintings of the White Mountains by White Mountain artists. Several inns and hotels were built to accommodate the wealthy, who sought relief from the summer heat, humidity and pollution of coal-age Boston, Hartford, New York and Philadelphia. They often relaxed by taking carriage rides through the White Mountains, or by hiking along the Lost River in Lost River Reservation. But with the advent of automobiles, patrons were no longer restricted by the limits of rail service. Consequently, many grand hotels established near depots declined and closed. Woodstock, however, remains a popular tourist destination.