This chapel, adorned with Masonic symbols but devoid of other religious symbols, occupies much of the second floor.

The chapel is surrounded by thick Doric columns, and illuminated by a skylight. Rows of pews in the nave face a dais on which stand two Ionic columns. At the center of the dais is a throne. On either side behind the platform are two burial chambers. Other burial chambers are behind the columns on either side of the nave.