The Krämerbrücke is Erfurt's most interesting piece of secular architecture.

 
The stone, arched bridge was constructed in 1325 over the Gera River ford, built through and following the trading route of the "via regia". 

The Krämerbrücke is the only bridge north of the Alps to be entirely built over with houses that are still used as residences. In medieval times there were churches built at either end of the bridge, one of which, the Ägidienkirche, is still in existence.