Gold Coast Railroad Museum, Miami
The Gold Coast Railroad Museum is basically in the parking lot of ZooMiami (formerly the Miami Metrozoo). Some of the buildings used by the museum were part of the Richmond Naval Air Station, a WW2 lighter-than-air hangar and maintenance facility. I photographed a few of these structures several years ago.
The first two pictures show interesting shapes, but I have no idea what they are/were for. The third is of one of the few remaining pieces of three large, mostly wooden hangars that were destroyed by fire in 1945. It's used now as a tower for telecommunications antennas.