Nidhe Israel in Barbados - 1641, rebuilt after 1831, using most of the original fittings. It now houses a Reform-Conservative Ashkenazic congregation that uses it for half the year, and a newer synagogue with aircon in the summer. I read shaharith and minha here alone every day when doing the restoration work on the cemetery - but one memorable day had a minyan for minha. ( The hechal and brasswork survived the hurricane, as did many other elements. The original had rounded arches in the windows, the restoration, gothic.)