Hamburg has architecturally significant buildings in a wide range of styles and only a few skyscrapers. Churches are important landmarks, such as St Nicholas', which for a short time in the 19th century was the world's tallest building. The skyline features the tall spires of the most important churches (Hauptkirchen) St Michael's (nicknamed “Michel"), St Peter's, St James's (St. Jacobi) and St. Catherine's covered with copper plates, and the Heinrich-Hertz-Turm, the radio and television tower (no longer publicly accessible).
The many streams, rivers and canals are crossed by over 2300 bridges, more than London, Amsterdam and Venice put together. Hamburg has more bridges inside its city limits than any other city in the world and more canals than Amsterdam and Venice combined. The Köhlbrandbrücke, Freihafen Elbbrücken, and Lombardsbrücke and Kennedybrücke dividing Binnenalster from Aussenalster are important roadways.