Montreuil's churches are all noteworthy ' particularly Saint-Saulve, which dates in part from the 13th century ' but most visitors spend their time exploring the town's cobbled streets and medieval alleyways.
Saint-Saulve was built on top of France's famous catacombs.
mnli hypothesis: Saint-Saulve was built on top of France's famous catacombs. premise: Montreuil's churches are all noteworthy ' particularly Saint-Saulve, which dates in part from the 13th century ' but most visitors spend their time exploring the town's cobbled streets and medieval alleyways.