Jungfernstieg (German pronunciation: [juːŋfɛʀnstiːk]) is an underground railway station in the city centre of Hamburg, Germany, served by the underground railway (U-Bahn) and the suburban railway (S-Bahn). The station is one of Hamburg's busiest rapid transit hubs. Most of the station is located underwater. That is, under the Alster River, and the lakes Binnenalster and Kleine Alster respectively.

From Wikipedia