. >> the estate is actually a collection of three houses -- the main villa, a gatehouse, and a two-storya. >> al capone wanted to be protected from the land and from the sea. >> the guesthouse, which served as the guardhouse during capone's days, has peepholes that would help determine if a visitor could be let in, and it's protected by a 7-foot wall and a heavy gate. ♪ al capone used his palm island estate as a getaway from his life as a big-time chicago gangster. >> it's a mediterranean flavor, and this historical building, it's a part of the eastern united states and of miami. >> when capone moved in in 1927, he immediately began over $100,000 worth of upgrades. he built this pool, which at the time was the largest privately owned swimming pool in the area, connected to the bay with a filtration system able to handle both sea- and freshwater. capone added a new dock for his speedboats, new garages, a boathouse, and details like rock gardens and fountains. >> i want to show you the grotto, the bridge, and the lighthouse. >> the coral and rock grotto lighthouse and bridge is where al an