Conversation so far:
What type of settlements were there in Gaelic Ireland?
There were very few nucleated settlements, but after the 5th century some monasteries became the heart of small monastic towns.
What did the buildings in Gaelic Ireland look like?
For most of the Gaelic period, dwellings and farm buildings were circular with conical thatched roofs.
What material were the buildings in Gaelic Ireland made of?
In some areas, buildings were made mostly of stone.
Did the buildings of Gaelic Ireland survive?
Gaelic families began building their own tower houses by the 1400s. They are concentrated in counties Limerick and Clare but are lacking in Ulster, except the area around Strangford Lough.

Question: What else did they build during this time period?
Self-contained rewrite: What else did the people of Ireland build during the Gaelic period besides circular dwellings and farm buildings with conical thatched roofs, and tower houses?