The list of fortifications in Switzerland contains fortifications from the 15th century to the end of the Cold War.
In the Middle Ages, towns were fortified with town walls in their defense. From the 19th century fortifications were built near the border at strategically important pass crossings and train tunnels.
The fortresses were largely built during World War II and during Army 61 and decommissioned with Army Reform 1995 and Army XXI. The Swiss Army maintained artillery fortresses equipped with 7.5 cm, 10.5 cm turret cannon or 15 cm guns. The guns were in casemate, turrets or in rearward positions they were in embrasures.
Some have been made accessible as a museum or can be visited on request.
In addition to the artillery works, the infantry blocking points of the infantry were permanently fortified throughout Switzerland.
Source: [1]