Travels I need to book way ahead of time

Travels I need to book way ahead of time I recently did a trek to Hang Son Doong in Vietnam. It’s the largest cave in the world, was first explored only in 2009, and has strict limits on the number of tourists a year (around 1,000). Because of this, the waitlist can be quite long, and I had to book the tour about a year (!) ahead of time just to get a spot. Despite all the advance plan...

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