Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.from-ireland.net/good-luck-charms-in-foundations-co-monaghan/
Description:
Items were buried in the foundations of the house and these were of two kinds: religious or superstitious. The main place for burial was under the foundation stone of a house. A new coin with the date of the year in which the house was built was the most favoured.