Many churches are decorated with stained glass windows, elaborate woodwork, and even ornamental paintings.
However, the Transfiguration of Our Saviour, Greek Orthodox Church in Lowell, Massachusetts has gone above and beyond the customary.
For the last 42 years, one local artist has helped to revive Byzantine mosaics and transformed the church into a work of art.
NHPR Correspondent Hilary McQuilkin reports.