Engineering & Megastructures - 77 free documentaries about building sites.
Start with Could A 13th Century Castle Be Built Today? (59 min, Absolute History), then The Hidden Engineering Behind Texas's Top Tourist Attraction (21 min, Practical Engineering). All 77 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on building sites is Built by Roma Agrawal.