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I am trying to learn a little more about Travel SEO, particularly in the "hotel" vertical. what are some of the top Hotel SEO sites out there and what are they doing right? Tripadvisor is great at SEO in general, but I've heard they struggle a little in the "hotel" vertical. Is there anything they can do to improve their rankings in this area?  Does anyone have any suggestions, whether it be a far out idea or on-site optimization? Thanks!