The Anne Frank industry grows and grows. If you want to really savour the atmosphere of the house where Anne and her family hid during World War II you need to get there very very early in the morning to avoid the crowds.
In late 2007 and early 2008 there was a huge row about plans to demolish the horse chestnut tree Anne wrote about in her diary. It is now held up with a huge steel cage.
Anne Frank foundation website
There were other secret attics and annexes where Jewish families hid - occasionally a new one is discovered and written about in the papers. Friends of mine found a tiny secret room when they were rennovating their house in an old part of the city. I was told that the owner of the building had been condemmed as a collaborator during the war because he made shaving mirrors for German soldiers. He could never say he had people hiding upstairs.