Something rotten...

...in the state of Denmark. Certainly it's a little unfair to describe this castle in those terms but it's the one at Helsingor that's reputed to be the inspiration for Elsinor, seat of Hamlet in the famous play of the same name.

Shakespeare, apparently, never visited so it might just be as much a fiction as the play itself. But try telling that to the hordes of tourists looking for Hamlet's bedroom!