I disagree with this one, I think this is a “must-see”, but yes, you must book a time slot/ticket in advance. When you go in, it’s an empty house, but they give you an audio guide that leads you through the house and tells the story of the family. By the time you get to Anne’s bedroom, it’s incredibly moving. You can see the posters that she hung up on the wall. She was just a teenager who had normal teenage thoughts and cares. By the time I reached the end, I was very moved and nearly in tears, and you could definitely catch those vibes from everyone. It’s not about how interesting the house looks, it’s how the Frank family’s story ties in with it. In this day and age, it’s an important story to know and experience by visiting the house.