Now a National Historic Landmark, Center Church on the Green is situated right on the New Haven Green. It is the oldest church in New Haven, founded in 1638, and was previously known as First Congregational Church. The present building dates from 1814 and was built over part of the burying ground. Some gravestones remain in the basement crypt, and may be visited from 11 am to 1 pm Thursdays and Saturdays for tours. Many people were buried on the green; in 1821 almost all of the remaining outside monuments were moved to Grove Street Cemetery (at Grove Street many of those tombstones are around the inside wall in alphabetical order.)