07/22/2013 02:56 pm ET Updated Sep 21, 2013

Scotland Tour: Thatched Wooden Huts on the Loch -- from 2,500 Years Ago

Across Scotland, archaeologists know that little round islands on the lakes are evidence of crannogs -- circular houses built by big shots 500 years before Christ. They built on the lakes because in an age before roads, people traveled by boat, and because waterways were easily defended against rampaging animals and bad guys. There are 18 such crannogs on Loch Tay, north of Edinburgh. One is now the Crannog Centre, a museum staffed by people dedicated to learning about and teaching about these people. Our tour visited and saw amazing crafts demonstrated -- including making fire by rubbing sticks.

How and where have you been impressed by prehistoric surprises in your travels?