Tiny Pigeon Key is an island west of Marathon on the Overseas Highway, which originally served as a construction camp for the first railroad built through the Keys. It is now listed on the National Register of Historic Places and operated by the non-profit Pigeon Key Foundation as an historic preserve. Visitors can explore a railroad museum featuring artefacts and photographs about the original Flagler railroad and building of the old Seven Mile Bridge. Some of the cottages have been restored. The tiny island makes for an interesting historical attraction and a visit feels a bit like a step back in time. Guesthouses are available for small groups wanting to overnight in a restored, historic building on the island. Pigeon Key can be reached on foot or by ferry.