19th century thumb|The intersection of 11th Street and Pennsylvania Avenue, N.W., in 1921 In 1832, in an effort to tame dust and dirt on Pennsylvania Avenue, it was paved using the macadam method. But over the years, other pavement methods were trialed on the avenue: cobblestones in 1849 followed by Belgian blocks and then, in 1871, wooden blocks.
19th century thumb|The intersection of 11th Street and Pennsylvania Avenue NW in 1921 In 1832 in an effort to tame dust and dirt on Pennsylvania Avenue it was paved using the macadam method But over the years other pavement methods were trialed on the avenue cobblestones in 1849 followed by Belgian blocks and then in 1871 wooden blocks