The Karl Theodor Bridge commonly known as the Old Bridge (German: Alte Brücke), is a stone bridge in Heidelberg, crossing the Neckar River. It connects the Old City with the eastern part of the Neuenheim district of the city on the opposite bank. The current bridge, made of Neckar Valley Sandstone and the ninth built on the site, was constructed in 1788 by Elector Charles Theodore, and is one of the best-known and amazing landmarks and tourist destinations in the history of Heidelberg.