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Penn

Philadelphia City Hall
Society: ASCE Main Category: Civil Sub Category: Buildings Era: 1900-1909 DateCreated: 1901 1 Penn Square Philadelphia State: PA Zip: 19107 Country: USA Website: http://www.asce.org/Project/Philadelphia-City-Hall/ Creator: McArthur, John , Walter, Thomas

Philadelphia City Hall was the largest masonry load-bearing wall building in the world at the time of its completion in 1901, stood as the tallest occupied building in the United States until 1909, and still is the largest city hall in the United States. The building covers 14.26 acres, originally contained 634 rooms with over 1 million square feet of space, and with its tower and statue of William Penn rises a total of 548 feet above the ground. The construction of Philadelphia City Hall began in 1872 and was completed in 1901.

YearAdded:
2005
Image Credit: Courtesy Flickr/elPadawan (CC BY-SA 2.0) Image Caption: Philadelphia City Hall Era_date_from: 1901
Mason-Dixon Line
Society: ASCE Main Category: Civil Sub Category: Boundaries & Surveys Era: 1750-1799 DateCreated: 1767 Delaware Pennsylvania State: Zip: Country: USA Website: http://www.asce.org/Project/Mason-Dixon-Line/ Creator: Mason, Charles , Dixon, Jeremiah

The granite milestones marking the Mason-Dixon Line bear crests from the two parties involved in the land-grant dispute, the families of William Penn and Charles Calvert (also known as Lord Baltimore). 

YearAdded:
1977
Image Credit: Original Image: Flickr/Padraic (CC BY-SA 2.0) Image Caption: Mason-Dixon Line Era_date_from: 1767
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