https://the-line-up.com/7-greatest-unsolved-mysteries
http://www.msn.com/en-us/news/world/16-of-historys-greatest-unsolved-mysteries/ss-AAikhbQ#image=4
https://en.wikipedia.org/wiki/Nazca_Lines
http://www.ancient-origins.net/myths-legends/does-bimini-road-lead-lost-civilization-atlantis-002070
http://biminiroad.weebly.com/different-theories.html
https://en.wikipedia.org/wiki/Mohenjo-daro
https://rationalwiki.org/wiki/Wedge_of_Aiud
http://coolinterestingstuff.com/aluminium-wedge-of-aiud-mystery
https://en.wikipedia.org/wiki/Piri_Reis_map
https://en.wikipedia.org/wiki/Shroud_of_Turin
http://www.bbc.co.uk/history/ancient/anglo_saxons/arthur_01.shtml
http://www.ancient-origins.net/unexplained-phenomena/who-made-petroglyphs-mysterious-dighton-rock-004991
http://www.smithsonianmag.com/history/abandoned-ship-the-mary-celeste-174488104/
http://coolinterestingstuff.com/the-lost-city-of-atlantis-the-facts