You don't have to have a strong religious faith to appreciate the peaceful atmosphere of Brechin Cathedral. Inquire when the next mass is scheduled or when you can go for a wander through.
This principal church is in Brechin, a place that has plenty of things going for it! House of Dun, Aberlemno Stones, and Brechin Town House Museum are other good sightseeing options close by when you've had your fill of Brechin Cathedral.