A National Historic Landmark, and ranked as one of the top 10 most important buildings in the country by the American Institute of Architects, Trinity Church, designed by Henry Hobson Richardson and built in 1877, is still a sight to behold with magnificent steeples and stained glass windows overlooking Copley Square. It's a major draw for tourists, especially in the summer, and self-guided tours of the interior are available daily for $6. The price is worth it, but you can also see the inside for free on Sundays at 12:15pm.

Heavy rounded arches, rough stone and the use of many colors propelled Richardson and Trinity Church to international fame, and it's considered the start of the "Richardsonian Romanesque" architectural style.

Trinity Church is also known for its collection of stained glass windows, including 19th-century work by John La Farge, one of the first to use a layering technique that brought new colors, shadings, and a three dimensional look to stained glass.

Downstairs from the sanctuary, visit the Shop at Trinity Church, where you can purchase a tour or pick up a unique spiritual gift. Religious and secular items include books recommended by the clergy, stationary, jewelry, postcards and other souvenirs. Much of it is designed by local artists.