38:29

Rings, embankments and ditches, in Britain.

39:25

THROUGH THE LAKE NEMI OUTFLOW

26:53

Avi Loeb STUNNED After 3I/ATLAS Survives the Sun — NASA Detects Mysterious Debris!

36:46

Giant siphons at Lugdunum

1:03:08

Castle Builders: The Secrets of Medieval Engineering - Full Documentary