between philadelphia and mt. vernon for a not very presidential reason. with us now is lee around ornol senior director of the library and collections and chief operating officer. thanks so much for joining us. it s a pleasure to be here. you re the historical person forgo to facts. i m happy to be here. i ve been with the historical society for 24 years and tour guide within the city. it s always amazing that people even locals don t know a lot of the history of their own city and area. one of the first ones starts with the founding of philadelphia and that it was first founded by william penn, a quaker. you already mentioned early that race street used to be called sasa frasthe east/west trees were named for trees and north/south after numbers and philadelphia was the very first city built on a public grid and public quar system in the united states and also first city that established a street numbering system based on numbers systemically. and why numbers and trees?
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