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Text version: https://www.toptenz.net/10-mysteries-...

Coming up:

10. The Romans May Have Discovered the New World
9. Ancient Roman Mystery Cults
8. The Lost City of Paititi
7. The Economy of the Incas
6. The Lost City of Tenea
5. The Mystery of Teotihuacan
4. The Mystery of the Origin of the Sumerian Language
3. The Fall of the Akkadian Empire
2. The Lost Ruins of Vlochos
1. The City of Akkad

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Source/Further reading:

https://commons.m.wikimedia.org/wiki/...
https://www.needpix.com/photo/downloa...
https://www.flickr.com/photos/gbaku/1...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://www.gaia.com/article/out-of-p...
https://www.techtimes.com/articles/11...
http://www.andrewcollins.com/page/art...
https://www.asc.ohio-state.edu/mccull...
https://www.express.co.uk/news/histor...
https://brewminate.com/wp-content/upl...
https://www.metmuseum.org/toah/hd/mys...
https://commons.wikimedia.org/wiki/Fi...
https://www.britannica.com/topic/myst...
https://www.flickr.com/photos/pdc/820...
https://mysteriesrunsolved.com/2020/0...
https://peruadventuretrek.com/paititi...
https://artsology.com/the-arts-advent...
https://paititi-institute.org/a-year-...
https://www.peru-explorer.com/economy...
https://sites.google.com/site/mostcul...
http://www.discover-peru.org/inca-eco....
https://io9.gizmodo.com/the-greatest-...
https://www.bbc.com/news/world-europe...
http://www.bbc.com/travel/story/20190...
https://www.history.com/news/lost-tro...
https://www.smithsonianmag.com/smart-...
https://en.wikipedia.org/wiki/File:Te...
https://en.wikipedia.org/wiki/File:Te...
   • Ancient Aliens: Aztec God's Visit (Se...  
https://en.wikipedia.org/wiki/File:Pa...
https://en.wikipedia.org/wiki/File:Fr...
https://en.wikipedia.org/wiki/File:AO...
https://en.wikipedia.org/wiki/File:Le...
https://en.wikipedia.org/wiki/File:Su...
https://www.needpix.com/photo/downloa...
https://www.nytimes.com/1993/08/24/sc...
https://www.ancient-origins.net/ancie...
https://www.ancient-origins.net/ancie...
https://commons.wikimedia.org/wiki/Fi...
https://www.thesun.co.uk/news/2395397...
https://history.howstuffworks.com/his...
https://greece.greekreporter.com/2016...
https://archaeologynewsnetwork.blogsp...
https://en.wikipedia.org/wiki/File:Sa...
https://en.wikipedia.org/wiki/File:Mo...
https://en.wikipedia.org/wiki/File:Um...