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1. The Unfinished Obelisk

For how long and complex human history is, it's no big surprise to me that it would miss a few major places and events, right? Well we'll help you fill in the gaps a bit.

This obelisk was recently found in Aswan, Egypt, and was ordered to be constructed by Hatshepsut in the mid 1500s BC. The obelisk was never finished, but if it had been, it would have been Egypt's largest.

2. Yonaguni Monument
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It's debated among experts whether or not this underwater monument off the coast of Japan was created naturally or by man. It features twin obelisks that appear to have been placed there, as well as a formation above it called "the turtle." What do you think made it?

3. The Stone Spheres of Costa Rica
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This is quite the mystery! Not much is known about this giant spheres other than the fact that they were likely made by the Diquis people who lived from 700 to 1530 AD. Legend has it that these spheres were originally made in Atlantis, but it's all speculation.

4. The Longyou Grottoes
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These tunnels found in Zhejian, China are enormous and date back as far as 212 BCE. They are covered from floor to ceiling in precise, 60 degree angled markings.

5. Göbekli Tepe
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This was a major find because it made scientists rethink the origins of human society. It was found near a mountaintop in turkey and predates agriculture, which indicates that primitive religion may have been what originally brought civilization together, not commerce. This monument dates back to 10,000 BCE.

6. Boheno-Daro
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This interesting ancient city, built in 2600 BCE in what is now Pakistan, is one of the earliest examples of city planning. This town contains roads and a drainage system that worked like a sewer.

7. Saksaywaman
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Saksaywaman is a fortress outside of Cusco, Peru - the former capital of the Incan nation. These giant rocks are fitted tightly together. Hundreds of years later, you can't even fit a piece of paper through them. Now that's tight!

8. L'Anse aux Meadows
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This settlement in North America is believed to have been built by the Vikings 500 years before Columbus discovered the continent for the European empire. It's incredible to think that vikings made it all the way to North America from their home in Northern Europe.