Experimenters Bethan, Corey and Rhianna see what happens when you build a dam in a stream.
Triangles
Pointy Roofs
Piers
Nests
Houses
Windmills
Beaver Dams
Skyscrapers
Bridges
Demolition
Floating Houses
Rollercoasters
Arches
Lighthouses
Living Underground
Living Underwater
Igloos
Spiders' Webs
Domes
Amphitheatres