There is no way to objectively know the most popular books in world history, but the following infographic (from Lovereading.co.uk) gives a good guess based on estimated editions, translations, and copies sold.
That is one seriously impressive infographic.
THE BEST OF WOMEN IN COMICS 2014
A remarkable year for women in comics. This is one of the most interesting things going on in the book and book-related world.
One reason the “best books” lists were the most diverse is because they were the longest. While most of the lists looking at movies and TV shows were limited to 10 or 20 titles, a lot of the books lists topped 100 titles.
Interesting to see that end of year book lists tend to vary more than other media. Also, many more books are published by major houses each year than movies or records or TV shows are released by major studios, so there are simply more to choose from.