One of the last round towers to survive in Dublin

Sword’s Round Tower stands 26 m high and is instantly recognizable from its crumbling windows and cap and its unique stone cross at its apex. The square belfry that stands beside the round tower is a 14th-century medieval church and its low doorway is due to the ground level being raised over time. This was the location where St Columba reputedly founded a monastery here in 512. Over the years it has been burnt and pillaged for its treasure. This was also reputedly where the body of Brian Boru was rested after The Battle of Clontarf in 1014 on his way to Armagh for burial.

Thanks to Life in Europe for informative video