Step inside and the temperature of the visit changes completely — Trinity's interior is a deep, glowing cave of John La Farge murals and rich stained glass, one of the great enveloping church spaces in America and a genuine surprise after the brisk plaza outside. Out on Copley Square the payoff is the famous old-meets-new shot: Richardson's heavy 1877 Romanesque sandstone reflected whole in the mirror-glass face of the tower across the way. The honest split: the muralled interior is the real reward and worth the modest admission, while the exterior-and-square is a handsome but quick 15-minute photo stop, and services can close the doors to visitors.
Designed by H.H. Richardson and built 1872-1877, it is the foundational work of Richardsonian Romanesque; an 1885 architects' poll named it the finest building in the U.S. · en.wikipedia.org
Richardson conceived it as a 'color church'; John La Farge's interior murals and stained glass cover over 21,500 square feet, with a suggested $10 tour donation. · trinitychurchboston.org