From Wendover Productions--a Youtube channel dedicated to explaining how our world works, from travel, to economics, to geography--comes a two part series called "Every Country in the World."
In 30 minutes, the videos traverse the world, telling you curious facts about 190+ countries, starting with this: China, despite being so vast, doesn't have time zones. It's the same time across the entire country. Meanwhile it's neighbor, Afghanistan is "offset from Greenwich Mean Time by a 30 minute interval." When it's 9 am in San Francisco and 5:00 pm in London, it's actually 9:30 pm in Kabul.
How about another factoid: Canada is so geographically large that it's eastern border is closer to Croatia than Vancouver. Get the gist?
You can watch "Every Country in the World" above and below.