Archaeology project explores evolution of Jamestown fort

No one expected archaeologist William Kelso to find the "lost" English fort built at Jamestown, Virginia in 1607, but he did. Now the 70-year-old expert hopes to follow the evolution of the fort with the help of university students. (video)

The latest project for Kelso is a guardhouse, built in 1608, and expansion of the original fort to its 1617 dimensions. "Our original goal was to find the fort — then trace its evolution through time," Kelso says. "There's so much left to discover here you could keep digging for years."