Long barrows are Neolithic constructions that might have been churches, or graveyards, or landmarks. And some are being built again: for the first time in recorded history. Video 6:04 15 votes
Well before the first climbing frame was patented as "jungle gym", mathematician Charles Hinton thought they might be able to teach kids four-dimensional thinking Video 3:43 15 votes
The treadmill/treadwheel crane sounds like something from Astérix or the Flintstones. But at Guédelon in France, not only do they have one, they're using it to help build their brand new castle. Video 6:23 7 votes