When I wanted to visit this museum, I thought the museum had a special old sewer area and history about the sewer. When I first entered the museum, it did as I thought, but at the back, you really entered the sewer, and your feet were full of water, my God is so stinky! I don't know how anyone else can stay and continue to visit (I'm tired of getting the flu, so I may have less tolerance for the smell). This museum is special, but I won't spend money to visit it. Tickets are included in the pass and I am glad I don’t have to pay extra.