Situated beside the village of Milltown are the remains of the Abbey/Monastery, Church and Round Tower of Drumlane, which dates back to the year 555.
The Round Tower, the only one in the Diocese of Kilmore now stands as a silent senital to the Viking invasion. These remains are located between the tranquil lakes of Derrybrick and Drumlane
The founder of Drumlane is believed to be Saint Colmcille. Drumlane was the site of an annual pilgrimage in the later middle ages, and the ruined church contains some late medieval carvings.
A crannog can be seen in the lake just behind the remains of the medieval abbey. Crannogs were artificial islands built in lakes for protection against attackers and wild animals. They were used and reused between 1000 BC and 1600.