When my dad was about six, I think, he came across Richard Halliburton's Complete Book of Marvels. He read it over and over again. It was formative, giving him big goals, speaking to him in ways so deep that it affected my own childhood (unbeknownst to me at the time). It made him a world-traveler who has now seen more than half of these wonders, probably closer to 75%. So this book gets extra points for its legacy for my family. It almost feels like honoring my dad to read this to my kids for homeschool.
And it's a great read. Halliburton has a gift for relating an interesting historical tale associated with the landmark he's visiting. He's also a daredevil; my kids quickly picked up on the fact that as soon as he started describing how dangerous or high a place was, his next words would always be, "So now of course we're going to climb it."
After a while, the elaborate descriptions of the places run together to me. But the history really makes it stick.