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14 Least Visited National Parks in the United States
history.howstuffworks.com/american-history/least-visited-national-parks.htm
Most people flock to Yellowstone, Yosemite, or the Grand Canyon, but the least visited national parks offer something just as remarkable: solitude.
Can You Match the National Park to the U.S. State?
play.howstuffworks.com/quiz/can-you-match-the-national-park-to-the-us-state
There's so much more to America than fascinating buildings and elaborate cityscapes. This U.S. national parks quiz showcases nature's outstanding design achievements. Prepare to be wowed by stunning facts and photos!
5 Most Amazing Caves
science.howstuffworks.com/environmental/earth/geology/5-amazing-caves.htm
The Doll's Theater of Carlsbad Caverns looks otherworldly and took ages to form. What other incredible sights await us below ground?
Can You Match These American Landmarks to Their State?
play.howstuffworks.com/quiz/match-american-landmarks-to-state
Every state has its unique landmarks, some of which are more popular than others. How well do you know the ones across your country? Let's find out!
Can You Name All of These World Heritage Sites?
play.howstuffworks.com/quiz/can-you-name-all-of-these-world-heritage-sites
We only have one Earth, and the easiest way you can show your appreciation for it is by recognizing its brilliance. Some of the world's most endangered animals, oldest cities and rarest land formations are protected in World Heritage Sites around the globe. Put your skills to the test and see if you can recognize them all.
10 Weirdest Sources for Antibiotics
science.howstuffworks.com/life/cellular-microscopic/10-weirdest-sources-antibiotics.htm
Many lifesaving antibiotics are discovered in some pretty nasty places. Here are the 10 weirdest sources for antibiotics at HowStuffWorks.