Originally Posted by courage2

Every Tuesday I walk by what is possibly the largest armory in the world, a giant and abandoned brick edifice behind chain link fence and a living wall of weeds and debris.

I've been noticing a flower there but unable to identify it. Today I realized the plant isn't a vine -- it's a shrub whose younger branches have merely grown up entwined around the fencing. Then I could identify it -- it's a Rose of Sharon, rose mallow, or hardy hibiscus, Hibiscus syriacus.