Rheinturm (Rhine Tower), Dusseldorf (must see)

The Rheinturm, or Rhine Tower, is a 789-foot tall telecommunications tower. It carries broadcasts for radio and television but is best known for being the tallest building in the city. Along with its functional properties, the Rhine Tower is home to an observation deck and a revolving restaurant.

Construction on the tower began in 1979 and was completed in 1981. Largely made of reinforced concrete, the Rhine Tower weighs an impressive 22,500 tons. It was designed by architect Harald Deilmann, who is best known for his work on university buildings, theatres, hospitals and office buildings.

A sculptural clock on the Rhine Tower's shaft called Lichtzeitpegel, or Light Time Level, was designed by Horst H. Baumann. The number of dots represents the hour, minutes and seconds. It is the largest digital clock in the world.

The observation deck is open to the public daily from 10 am to midnight. The restaurant within the Rhine Tower, QOMO, is open from 6 pm to midnight.