Rhine Gate

The Basel city walls are a complex of walls surrounding the central part of the Swiss city of Basel, only partially preserved today. The first city wall was completed around 1080 under bishop Burkhard von Fenis. A newer wall was constructed around 1230, which is known as the Inner Wall. Its course was mostly identical to the Burkhard wall. In 1362 the construction of a larger wall complex began due to the city's expansion; it was completed in 1398, and is known as the Outer Wall. In 1859 the city's executives decided to raze the inner wall and gates to the ground. Three outer city gates and a short piece of the wall were saved from demolition and are being preserved as part of the city's heritage.

At the end of the 11th century, the growing settlement in the valley was walled, though settlement continued outside the wall. As the town spread up the west slopes surrounding the Birsig river, that section was walled also. At the beginning of the 13th century, all these sections were included within a single wall that embraced both the valley and hill settlements. New walls were built around 1400, and those are the ones that lasted until the mid-nineteenth century.

Wikipedia