https://www.ancient-origins.net/news-history-archaeology/stone-doorway-kazakhstan-0022418
https://www.coasttocoastam.com/article/giant-ancient-doorway-triggers-et-debate/
TPI is an Exploration of Myths, Legends, UFOs, Entities and all sorts of other Anomalies & Mysteries in the Multiverse of Sci-Fi & Popular Entertainment.