Fortifications of the first belt
Fortifications of the second belt
The ceintures de Lyon ([sɛ̃.tyʁ də ljɔ̃]; "Belts of Lyon") were a series of fortifications built between 1830 and 1890 around the city of Lyon, France, to protect the city from foreign invasion.
The belts comprised two defensive barriers that included forts, lunettes, ramparts, batteries, and other defensive structures. Many of these structures proved to be ineffective in war due to advancement in weapon technology and the evolution of attack strategies at the time. Some of the fortifications of the ceintures de Lyon have been destroyed, though many remain today.