Saint-Pierre gate, Nantes

The Saint-Pierre gate (also known as the Bastion Saint-Pierre Gate or Manoir Guéguen) is the best-preserved remnant of the city walls of Nantes, France. == Overview == Constructed in the 15th century for its lower section and built upon Gallo-Roman foundations from the 3rd century, the gate also incorporates remnants of the 9th to 13th-century enclosures.

Source: Wikipedia — Saint-Pierre gate, Nantes (CC BY-SA 4.0)