1. A method comprising: creating logical models with respect to urban infrastructure in a first location; creating system-level models with respect to the logical models; performing simulations on the system-level models to verify expected behavior; employing feedback from the performed simulations to forecast changes in the system-level models; wherein said creating of logical models comprises assimilating data from physical sensors; wherein said creating of system-level models comprises creating a model with respect to at least one of: urban infrastructure at the first location at a future timepoint; and urban infrastructure at a second location distinct from the first location; and providing the logical models and system-level models in a sandbox for subsequent use in creating at least one new logical model and at least one new system-level model for the at least one of: urban infrastructure at the first location at a future timepoint; and urban infrastructure at the second location.