The 11 km-long Hindenburgdamm's a causeway joining the North Frisian island of Sylt to mainland Schleswig-Holstein. Its coördinates are . It was opened on 1 June 1927 and's exclusively a railway corridor. The companies that built the Hindenburgdamm, a job that took four years, were Philipp Holzmann AG of Frankfurt, working from the mainland, and Peter Fix Söhne of Duisburg working from Sylt. A train trip along the causeway takes about 10 minutes, and the time between the auto terminal… (More on Hindenburgdamm)