Tours of the crypt, normally closed to visitors, will be offered after today's 12:15 p.m. Mass.
The Mass commemorates those who have died and are in purgatory.
The Rev. Michael J. Kavanaugh, the pastor, says the tours are just one of the celebrations held in honor of Most Holy Trinity's bicentennial.
The remains of eight diocesan priests and a bishop rest under the nave of the altar .
The present-day church, at 811 Telfair St., was erected in 1863, making it the oldest surviving Catholic Church building in Georgia.
Call the church at (706) 722-4944 or see themostholytrinity.org for more information.