Madame Tussaud's is not a tour. It is several floors of life-like sculptures of celebrities and historical figures. There is also a 3D Movie, plus an interactive experience that changes. It recently was Ghostbusters, now it is King Kong. I loved Madame Tussaud's, but it is overpriced. Make sure you use a discount coupon, or get a package deal that includes a bus tour and a meal.
It's not a tour it's up to you how fast you go threw the wax figures.
It's self guided. There aren't any staff-led tours. I recommend you reconsider visiting, this place is awful. I'm not joking or exaggerating.
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