My pitiful knowledge of geography is no secret to my family or anyone who knows me well. Although I navigated the best of the best that public education had to offer in Virginia, both in high school and in college, I learned very little of United States or world geography.
Anything I have learned in the years since has been while homeschooling my children, but all of them save the youngest know more than I do by now.
For a truly humbling experience - unless your world geography knowledge is quite hefty - try this out. My children are playing it daily to review their geography skills, and donating water around the world in the process.
And, so long as you're being humbled, check this out: