Funny enough, we have them downtown. They've flooded a few times due to the monstrous rains we get here (see hurricane harvey). I think Minneapolis figured thi

Funny enough, we have them downtown. They've flooded a few times due to the monstrous rains we get here (see hurricane harvey). I think Minneapolis figured this out the best with a downtown connected by skybridges on the 2nd floor connecting tons (most?) of the buildings).