https://www.nationalgeographic.com/travel/travel-interests/arts-and-culture/ancient-sites-built-by-aliens/
https://io9.gizmodo.com/who-built-these-structures-could-it-be-aliens-1276521709
http://www.syfy.com/syfywire/10_natural_formations_that_mightve_been_built_by_ancient_aliens
https://news.nationalgeographic.com/news/2007/09/070919-sunken-city_2.html
http://www.yonaguni.ws/
http://ancientufo.org/2016/03/yonaguni-monument-ancient-aliens-japan/
https://en.wikipedia.org/wiki/Easter_Island
https://en.wikipedia.org/wiki/Rongorongo
http://www.independent.co.uk/news/science/origin-of-stonehenge-theories-wales-a6763911.html
https://en.wikipedia.org/wiki/Stonehenge
https://ancient-code.com/the-ancient-city-built-by-the-sky-gods-teotihuacan/
https://en.wikipedia.org/wiki/Teotihuacan
https://news.nationalgeographic.com/2017/02/crystal-caves-mine-microbes-mexico-boston-aaas-aliens-science/
https://www.theancientaliens.com/puma-punku
https://en.wikipedia.org/wiki/Pumapunku
https://www.newyorker.com/tech/elements/baalbek-myth-megalith
https://www.atlasobscura.com/places/baalbek-trilithon
https://www.nationalgeographic.com/archaeology-and-history/archaeology/nasca-lines/
https://en.wikipedia.org/wiki/Nazca_Lines
https://en.wikipedia.org/wiki/Badlands_Guardian