I was reading Mathematical Mysteries for the last few weeks. Wow there are some beautiful relations, and some mind bending logic in maths.
I only read the first 2/3 of the book. So am not sure how it finishes, but I first part was thought provoking. I was also taking back by the level understanding in B.C. and early A.D. times.
[Edit 6-May: Noticed I’d called the book Magic of Munbers (via a google search for munbers) so fixed.]