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Places like Disneyland can handle large numbers because they're designed to - and they can be easily fixed up when the wear and tear of those visitors takes effect. You can't do that with places like Machu Picchu, Ankor Wat or any number of historic sites. They're fragile ecosystems and have to be respected, and numbers controlled, if they're to be preserved. Would you drop the Kitty Hawk in to the charter schedule on a busy day at Gatwick? No, because it is an irreplaceable slice of history, and wasn't built for that purpose.