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Show up to Machu Picchu without a permit booked months in advance, and you simply won't get in — no amount of showing up early or paying more on-site changes that. Show up to a Bangkok temple worrying you needed to book weeks ago, and you've wasted worry on something that was never an issue. The gap between "essential" and "walk-up friendly" destinations is genuinely one of the biggest trip-planning mistakes travelers make, and it's invisible until it's too late to fix. A quick check before you build your itinerary tells you which of your bucket-list sights actually need action now.