I'll file this under not for everyone, but worth reading if you're (or have been) a distance runner (particularly someone who has ... at some point ... logged many miles) or genuinely interested in ancient Greek history.
Karnazes runs, and runs, and runs ... a lot ... and covers a lot a ground. He's also (obviously) quite smart, and ... when he's running (or not running), he's obviously thinking, and ... the output (among other things) is books.
Unlike the other book by Karnazes I read, I thought the best aspect of this book was the Greek history, particularly the new theories based on serious research of varying types. Conversely, the travelogue was good and the running stuff was a mixed bag. I've only been to Greece a couple of times - most recently, a couple/few years back - and Karnazes' eye as a tourist both resonated and entertained. But my guess is that I would've enjoyed this book more if I hadn't read the other one first....
I'm a sucker for a good ending, and, alas, Karazes totally let me down, changing ... I can't say everything ... but too much for his closing riff. It might work for you, but it didn't work for me. The Epilogue masked much of my disappointment, but it came too soon on the heels of the disorienting concluding passages for me to forget my frustration with the author's last minute leap....
I've now read two of Karazes' books, and, while I've enjoyed (and been entertained) by both, I still haven't (and probably won't ever) fully appreciate or connect with Karnazes as a person. Don't get me wrong: I'm impressed by him, and I respect his achievements, and ... I support his endeavors with my (oh-so-nominal) purchases of his books ... but ... I can't say I'm a fan or that I even really think I would like him if I met him (not that that's relevant anyway). I'm not sure this really sunk in until I read multiple passages about people lining up to have their picture taken with him or have him sign their books.... And I thought, gee, if he was running through my town, I probably wouldn't bother (which surprised me, because I have a healthy collection of photos with, for example, bicycle racers and other celebrities of various ilk, and, over the years, I've enjoyed having many a book signed by the author).... Hmmmm.... I don't know what to make of it.
The pages turned quickly enough, I learned a few things, and I like thinking/reading about running. So, ultimately, I'm glad I read the book, but I just don't see myself recommending it broadly, because, well, it's very much a niche endeavor.