It is a power lesson in museology: the monumental past forcing the visitor to reflect on the present. Close to Fairmont Park and Philadelphia’s Art Museum, Rodin Museum and new Barnes lies Eastern State Penitentiary. This is an archaeological site with a difference: here you learn about the origins of modern prisons and their contemporary circumstances. What is hidden away has been preserved and made accessible with a brilliant audio tour narrated by the Hollywood actor, Stev

For forty years I have relied on remote sensing in Italy before starting to excavate. Mostly it has worked out well. In 1978 I found 9th-century grain silos full to the brim with burnt cereal just where the resistivity survey pinpointed them. In 1993 a survey identified the crypt of San Vincenzo Maggiore with alarming accuracy. In 2000-2 our geo-physics team located the previously unknown bridgehead Roman suburb of Butrint. We followed up with massive excavations that have al