This week the CBC TV show The Nature of Things had an episode on the discovery and archaeological rescue of one of the major harbors of Constantinople. I missed it, but fortunately the whole episode is on the web.
The reason that this harbor was found was the construction of a train tunnel across the Bosphorus. Both the construction of the tunnel and the archaeological rescue are technological wonders. This is a technological nerd-fest.
And the photography of Istanbul is great, too.
Did I mention that they found 37 medieval ships?
Image: rescue archaeology.