Indian Key at first appears like a typical South Florida island — mangroves on the shore, buttonwoods inland. But Brad Bertelli sees a different place. He sees Indian Key from almost two centuries back.”In its heyday, the island was home to as many as 150 people,” Bertelli said. “There were 45 buildings. There was a hotel with a nine-pin bowling alley. Billiards tables, restaurant, saloon.”Bertelli is a local historian. He leads tours of Indian Key and he’s the curator at the Florida Keys History and Discovery Center in Islamorada.