Communications in the Isle of Man were taken over by the GPO. The internal telegraph system was extended within a year to Castletown and Peel, however by then the previous lack of modern communications in Castletown had already started the Isle of Man Government on its move to Douglas. Due to increasing usage in the years following nationalisation, further cables between Port Cornaa and St Bees were laid in 1875 and 1885. By 1883 Smith's Directory listed several telegraph offices operated by the Post Office, in addition to those at Douglas, Ramsey, Castletown and Peel the telegraph was also available at Laxey, Ballaugh, and Port St.
Castletown, Isle of Man of the town and island are illustrated in four Manx National Heritage sites in the centre of Castletown: Castle Rushen, the Nautical Museum (in the secret passage-filled home of inventor, politician, banker and probable smuggler George Quayle), the Old Grammar School (originally a church from AD 1200) and the Old House of Keys. Fishing boats still go out to fish from the harbour. Commercial traffic to the port ended in the 1970s, although there has been an ongoing expansion of financial and industrial businesses in the area. The first telephones appeared in Castletown in 1901. Castletown is, along with Douglas,