The Oostpoort is the only remaining gate from Delft's medieval city walls, built around 1400. Featuring twin conical towers and an arched bridge over the canal, it creates one of the city's most charming views. The gate once guarded the eastern entrance to the city and stands as a fine example of Northern European Gothic architecture. Today it houses an art gallery and private residences, and visitors can walk through the gate and enjoy its reflections in the water.