Lithuanian restaurant at Union Avenue and Stagg Street. September 24, 1941. In the early 20th century, Eastern European immigrants began to settle in Williamsburg, including a significant Lithuanian community (today, the Church of the Annunciation of the Blessed Virgin Mary continues to provide services in Lithuanian). Across Union Avenue from the restaurant is Lithuanian Square (then Lituanica Square), a small gore park with a monument to two Lithuanian aviators who perished in a 1933 attempt to complete a transatlantic flight from Brooklyn to Kaunas, Lithuania.

Designed by William Mundell, the 47th Regiment Armory was built in 1884 on the site of a former baseball grounds. Containing an armory, club rooms, and later a drill hall, the armory was one of the few funded by the state and not Kings County. While the 47th Regiment left the armory in the 1800s, various Army occupants and the National Guard utilized the space until 2011.

Most Holy Trinity Church, ca. 1920-1940. In the latter half of the 19th century, Williamsburg had a significant German Catholic population. The first Most Holy Trinity church was a wood-frame building at Graham and Montrose Avenues, erected in 1853. A new French Gothic church by architects William Ditmars and William Schickel was built between 1882 and 1885. The massive church includes twin 250-foot steeples and stained glass windows imported from Austria. In 1990, the steeples were deemed structurally unsound and sheathed in lead cladding as a precautionary measure.

(Former) Colored School No. 3, later Public School 69 ARCHITECT: Samuel B. Leonard DATE: 1879-81 STYLE: Romanesque Revival Built in 1879-81, the former Colored School No. 3 schoolhouse was designed by architect Samuel B. Leonard, the Superintendent of Buildings and Repairs for the Brooklyn Board of Education. The only known “colored” school building remaining in Brooklyn, Colored School No. 3 as an institution evolved from the town of Williamsburgh’s original African Free School, which had been founded prior to 1841. The school was taken over by the Board of Education of the City of Brooklyn in 1855, when it was given the name “Colored School No. 3.” It was renamed P.S. 69 in 1887, and was later absorbed by the school system of the City of New York after the consolidation of 1898. Romanesque Revival in style, the school building has arched window openings and a prominent entrance with large keystones, a raised central section with a gable and blind arcade, corbelled brickwork, and dentil courses.