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In the USA during the early 1800's coins were nailed to the rafters of new houses to bring good luck to the inhabitants. These are found with the characteristic square nail holes through them and have been nicknamed "rafter cents". Also coins were nailed inside door frames or to basement beams etc. Here is a picture of one, with the nail still in place.
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS5lUM0LUsOfq3rsC8Z8TmQw1cOl5Rfum0Y_aRKZXtiH9QMONF2