You might not believe it, but I've gone around the world in less than a day, and so have lots of other people in the Epcot World Showcase. It represents eleven countries in the world, and even though it's not exactly the entire globe, I'd say it gives a pretty good representation on how diverse the world is. Each pavilion represents it's country with shops and restaurants. To make it even more symbolic, they are staffed with people from that specific country! Some pavilions also include attractions and shows about the culture. The World Showcase is very educational, but not in a boring way. You get to experience things about other places around the world there, whether it may be the history of it, their cuisine, or their traditions.
My family and I visit the World Showcase almost every day when we visit Disney World because we often eat at the restaurants there. It's always nice to eat foods from different countries, and I highly recommend you do. But it is critical that you make reservations since most places don't take walk ins. Honestly, you'll be lucky if you can get a table without a reservation, unless that specific restaurant is having a slow night. In my opinion, visiting the World Showcase is a place that you must check out during your time at Disney World.
-Kiana