https://wonderfulengineering.com/betz-sphere-makes-place-inexplicable-wonders/

Sceptic take on the Betz Sphere:

https://skeptoid.com/episodes/4334

Gobekli Tepe

https://www.ranker.com/list/facts-about-gobekli-tepe-turkish-archaeological-site/stephanroget

Oumuamua:

https://solarsystem.nasa.gov/asteroids-comets-and-meteors/comets/oumuamua/in-depth/