The world’s great hotels live and die by their fame – or infamy. Dubai’s seven-star Burj Al Arab, Leonard Cohen’s unmade bed at the Chelsea Hotel – and then there’s the Adlon. It achieved worldwide notoriety 20 years ago when Michael Jackson demonstrated his fathering skills by dangling his baby son out of the third floor window to horrified fans, and photographers, below. The Adlon has been a favourite with stars, and royalty, since it opened its doors in 1907. Kaiser Wilhelm II was a regular, allegedly for affairs and baths, because, unlike his nearby palace, the Adlon had discreet...