As Americans hit the road for summer holidays, a familiar question arises: Why don't Americans travel overseas more?

Of the 308 million-plus citizens in the United States, only 30 percent have passports, CNN reported in 2011. Most Americans spend their leisure time somewhere in the country rather than setting off across the seas that border the country on both sides. And a survey in 2006 revealed young Americans evenhad trouble locating Iraq and states within their country, says CBS News.

But thanks to travel bloggers and photographers, it's never been easier to experience the world from the comfort and privacy of your own homes.

Explore the world's natural wonders and awe-inspiring landscapes — and test your geography smarts — by taking our travel quiz above. Just guess which continent the place featured is located. Clicking for the next photo will reveal the answer.

And share your results with us: How many did you get right?What natural wonders, countries or continents are in your bucket list?

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