The city of Wuppertal is in North Rhine-Westphalia, Germany. The town is located in the river valley surrounding the river Whupper.
One of the city's attractions is its suspended monorail, the Wuppertaler Schwebebahn which was opened in 1901. The tram line is suspended 8 m above street level and 12 m above the River. It is both the oldest and the only electric elevated railway with hanging cars in the world. It's also still in use by the public and moves close to 29 million passengers annually. (2014)
The official name is the "Electric Elevated Railway (Suspension Railway) Installation, Eugen Langen System" ( Anlage einer elektrischen Hochbahn (Schwebebahn), System Eugen Langen).
The video, uploaded by VidetVidet to YouTube was shot in 2011 and takes a journey along the suspended railway's path.
For more details about the Wuppertal Suspension Railway see the Wikipedia page or the official site.