Pigeon Key is a small island containing the historic district of Pigeon Key, Florida. The 5-acre (2.0-hectare) island is home to 8 buildings on the National Register of Historic Places, some of which remain from its earliest incarnation as a work camp for the Florida East Coast Railway. Today these buildings serve a variety of purposes, ranging from housing for educational groups to administrative offices for the non-profit Pigeon Key Foundation. The former Assistant Bridge Tender's House has been converted into a small museum featuring artifacts and images from Pigeon Key's colorful past. It is located off the old Seven Mile Bridge, at approximately mile marker 45, west of Knight's Key, and just east of Moser Channel, which is the deepest section of the 7-mile (11 km) span.