Depends on what you want to educate them about. Ecosystems - Costa Rica. Art - Paris. Geology - Grand Canyon. Nearly every location can offer an education if you know what to look for and what the area has to offer.I would say my favorite educational places are Washington DC and Costa Rica. Washington DC has a museum for every topic under the sun, plus a huge history lesson around every turn. History, archetecture, art, politics, etc. It's the buffet of education. Costa Rica is just fun. You can learn about volcanos, wildlife, fauna, see coffee and banana plantations. It's completely different than DC, but just as interesting and twice as fun.