Live PTZ camera at Horseshoe Curve, the famous horseshoe-shaped railway curve near Altoona, Pennsylvania, USA. Opened in 1854 by the Pennsylvania Railroad to conquer the Allegheny Mountains, it is a National Historic Landmark and still in heavy use: Norfolk Southern freight trains and Amtrak's Pennsylvanian run over it. The camera moves to follow the trains rounding the curve. Streamed by Virtual Railfan.
United States - Altoona - Pensilvânia, EUA 
Canada - Ontario - Niagara Falls
Israel - Jerusalém
Brazil - SP - Aparecida
Japan - Tokyo