Advance
Cast Iron Structures
The development of more advanced metallurgy of wrought and cast iron allows for more elaborate metallic structures, such as pillars and columns, which makes building construction much faster.
VaccinationAdvancerequiresAdvance tree
- Vaccination
- Cast Iron Structures
Rotherham Plough then 3 more
Urbanization then 24 more
New Industry of Piacenza Only some countries
Requires 1
- VaccinationRevolutionsRequires
Belongs to 1
RevolutionsAge
Required by 3
- New Industry of PiacenzaRevolutionsRequires
- Rotherham PloughRevolutionsRequires
- UrbanizationRevolutionsRequires