One Liberty Observation Deck Philadelphia General Admission. View the entire city of Philadelphia from the One Liberty Observation Deck with this general admission ticket. Stand 833 feet (253 meters) above the City of Brotherly Love's streetscape to enjoy panoramic, 360-degree views. From this impressive building in the heart of Center City, capture aerial photos of nearby landmarks like Love Park, City Hall, Fairmount Park and the Schuylkill and Delaware Rivers. Learn about the city's history through the on-deck digital displays. Book and Save 8%: One Liberty Observation Deck Philadelphia General Admission.