The Riverside Inn was a hotel and dinner theater in Cambridge Springs, Crawford County in the U.S. state of Pennsylvania. Built in the late-1880s at the height of the mineral springs craze in the United States, it was operated as a resort for vacationers heading to the nearby springs that gave Cambridge Springs its name. The Riverside Inn was the first of many resorts to be built during that period. It was listed on the National Register of Historic Places in 1978. The Riverside Inn was destroyed by fire in the early morning of May 2, 2017. Design The Riverside Inn was a wooden, three-story hotel on the banks of French Creek in Cambridge Springs, Pennsylvania. On the outside corner of the main and northwestern wings was a three-story, hipped roof tower. A 2 -story, Shingle style, gabled structure called the Casino was originally built as a separate building southeast of the hotel, but was later connected to it. A boardwalk connected the hotel to the mineral springs. The only part of the boardwalk that remains are the concrete piers. A three-story, frame water tower with a hipped roof and hooded windows is located on the property. History In 1859, John H. Gray discovered a spring while searching for petroleum in the village of Cambridge, Pennsylvania. The village was incorporated into the borough of Cambridgeboro in 1866. Gray examined the water found in Hot Springs, Arkansas in 1884 and concluded that the water of his spring also had medicinal properties. Gray formed the Gray's Mineral Fountain Company in August 1884 and financed the construction of a sanitorium. The opening of the Riverside Hotel was postponed to July 1, 1888 by construction delays, but was the first built in Crawford County. Disputes between partners of in the company forced the hotel into receivership. In 1895, the Riverside was sold to William Baird. Baird also purchased Gray's mineral spring for $60,000. Cambridgeboro was renamed Cambridge Springs in 1897 to reflect the status of the borough as a spa town. Baird built a boardwalk from the hotel to the spring in 1899. Baird's son William Baird, Jr. took over management of the Riverside Hotel in 1910. A golf course was added in 1913, and was expanded to have 18-holes in 1923. The American Medical Association came to the decision in its medical journal in 1908 that "mineral waters possess no mysterious or occult