The town has been a significant maritime port since the Middle Ages, and was associated with Dover as part of the Cinque Ports in the 15th century. It became a popular place for holidaymakers in the 18th century, owing to easy access via the Thames, and later with the arrival of the railways; popular landmarks include the sandy beaches and the Dreamland amusement park. During the late 20th century, the town went into decline along with other British seaside resorts, but attempts are being made to revitalise the economy.