Hamburg has architecturally significant buildings in a wide range of styles. There are, however, only a few skyscrapers. On the other hand, churches like St. Nicholas's church, the world's tallest building in the 19th century, are important landmarks. The skyline of Hamburg features the high spires of the principal churches (Hauptkirchen) St. Michaelis Church (nicknamed “Michel"), St. Peter's Church, St. Jacobi Church (dedicated to St. James) and St. Catherine's Church covered with copper plates, and of course the Heinrich-Hertz-Turm, the once publicly accessible radio and television tower.The many streams, rivers and canals in Hamburg are crossed by over 2300 bridges, more than Amsterdam or Venice.Hamburg has more bridges inside its city limits than any other city in the world. To be completed around 2015, Europe's largest inner city development as of 2008, the quarter HafenCity, will house about 10,000 inhabitants and 15,000 workers. Its ambitious planning and architecture (among other designs by Rem Kolhaas and Renzo Piano will be realized) are slowly coming into shape. By mid of 2012, the Elbe Philharmonic Hall (Elbphilharmonie) is scheduled to house its first concerts in a spectacular building designed by the Swiss firm Herzog & de Meuron on top of an old warehouse.The many parks of Hamburg are distributed over the whole city, which makes Hamburg a very verdant city. The biggest parks are the Stadtpark, the Ohlsdorf Cemetery and Planten un Blomen. The Stadtpark, Hamburg's "Central Park", has a great lawn and a huge water tower, which houses one of Europe's biggest planetariums. The park and its buildings were also designed by Fritz Schumacher in the 1910s.