This noble Baroque building dates from the second half of the 17th century. The facade has a large doorway framed between two Tuscan Order pilasters of fluted shaft and sober entablature. Both the entrance and the coats of arms are carved in pink marbled stone. The different spaces and chambers are organized around a main courtyard with upper gallery; at ground level we find a first body of arches resting on Tuscan marble columns, the upper level is a gallery of rectangular balconies. There is also an additional yard, simpler, with a gallery of arches at ground level on one side and on the upper level of the other side a landscape-observation gallery crowned by cubical body battlements with pyramidal tops. The structure's load-bearing walls are made of rammed earth and slab with fully treated and restored wooden beams for its floors and ceilings.

This church features two distinct architectural styles: Gothic and Baroque. Estimated to date from the late 15th or early 16th century, the most valuable piece of this church is the stone situated in the facade — this is dedicated to the holy martyrs buried here. The interior is full of artistic treasures such as The Main Baroque Altarpiece, baroque sculptures representing the Immaculate Conception, and a 17th century wood carving attributed to La Roldana.

Fort McHenry National Monument and Historic Shrine played a pivotal role during the Battle of Baltimore in the War of 1812, inspiring Francis Scott Key to pen the words to "The Star-Spangled Banner" as he witnessed the fort’s defense. Today, visitors can explore the historic 18th-century fort, view exhibits about the battle and the anthem's creation, and watch the iconic flag fly above the site.