Philadelphia, metropoli in Pennsylvania, è la prima città degli Stati Uniti d'America a entrare nell'elenco dell'UNESCO come patrimonio dell'umanità per il suo ricco valore storico, culturale e artistico.
Il prestigioso riconoscimento dell'organizzazione era già stato dato nel 1976 al solo edificio dell'Independence Hall, dove il 4 luglio 1776 venne firmata la costituzione statunitense, ma da quest'anno si estende all'intero agglomerato.
La cittadina è divisa in due parti: una moderna, con grattacieli di vetro e insegne al neon, e una più antica con le case di mattoni rossi a due piani, strade poco trafficate e giardini curati. Quest'ultima si trova tra il fiume Delaware e il National Historical Park, il luogo dove si è fatta l'America.
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