Our Wonderful World by Ben Handicott and Kalya Rya
This book is a short encyclopaedia, it has a wide introduction of 50 countries along with the memorable moments, key facts, notable people and monuments.
There are many books who do have information about countries, but I found it to be different than all others. As all other books cover only one thing about countries like some are for language, flags, monuments, and etc. But in this book the author has managed very well to bring all that together and serve with the beautiful illustrations.
Though this is a kids book it can be helpful for anyone who is interested in learning or wants to gain knowledge about different countries. So along with the kids, this book is recommended to the very learning soul.