https://structurae.net/structures/buildings
https://structurae.net/structures/bridges-and-viaducts
https://structurae.net/structures/bridges-and-viaducts/motorway-bridges-freeway-bridges
https://structurae.net/structures/tunnels-caverns-and-shafts ,
https://structurae.net/structures/tunnels-caverns-and-shafts/below-grade-metro-and-light-rail-stations
https://structurae.net/structures/towers-and-masts
https://structurae.net/structures/tunnels-caverns-and-shafts/metro-tunnels-subway-tunnels tat
https://structurae.net/structures/tunnels-caverns-and-shafts/railroad-railway-tunnels
https://en.wikipedia.org/wiki/Montreal_Metro#Rolling_stock
