Horseshoe Curve is located in Altoona, Pennsylvania. It is an engineering marvel that was created by the Pennsylvania Railroad and opened to traffic in 1854. The curve has a length of about 2,375 feet (724 meters), making it one of the longest curves on any main line railroad in the United States. Horseshoe Curve offers amazing views of downtown Altoona as well as nearby mountains and valleys. Visitors can take guided tours around the curve or even ride along on a vintage steam train!