Tucked away in a patch of urban green is a tangible reminder of Miami's humble roots. Built in 1857, it's the oldest house in Miami-Dade -- a rambling cross between Little House on the Prairie and an Alabama shotgun shack. William Wagner was a white pioneer who settled here as the Seminole wars raged. He built the area's first postcolonial church, ran a mill nearby, married a Creole woman, and watched Miami grow from a malarial outpost to a real town. The house is so charmingly out-of-place you can't help but like it.