Anti-aircraft gun tower 5, L-Tower, Esterhazypark

This guide to anti-aircraft tower 5 in Vienna's Esterhazypark starts with the words an American artist wrapped around its roof in 1991, then works back to the tower's construction from 1942 under Nazi architect Friedrich Tamms, built in months by forced laborers and prisoners of war. It traces the fortress's strange postwar afterlife, when its walls proved too thick to demolish and it became in turn a hotel, a fire station and a children's observatory. Look up at the roofline as you listen for the words still wrapped around it.