Pennsylvania Avenue lighthearted celebrations, including a series of day- and nighttime Shriner's parades in the 1920s and 1930s. Thomas and Concepcion Picciotto are the founders of the White House Peace Vigil, the longest running anti-nuclear peace vigil in the US, at Lafayette Square on the 1600 block of Pennsylvania Avenue. After the Oklahoma City bombing in 1995, the Secret Service closed the portion of Pennsylvania Avenue in front of the White House to all vehicular traffic. Pedestrian and bicycle traffic, however, was still permitted on the sidewalk. After 9/11 this policy was made permanent. Near the White House traffic is redirected to
Pennsylvania State Game Lands Number 226 "Aplectrum hyemale", which is rare in Pennsylvania and extremely rare in northern Pennsylvania, is found in the game lands. In the upper reaches of Spruce Run in Pennsylvania State Game Lands Number 226, there are hemlock and mixed hardwood forests. Hardwood trees in this area include sugar maple, white ash, black birch, yellow birch, black cherry, basswood, and beech. At least 15 fern species, 12 sedge species, and more than 60 other woodland herbs inhabit the area. However, there are also invasive plants such as multiflora rose and autumn olive. Pennsylvania State Game Lands Number 226 were specifically managed for