Below NYC, three subway projects are underway. Can they be built without disturbing the massive system already in place?
Behind the scenes of the US Navy, you′ll see how they build and operate Destroyers, the fastest warships in the world.
I visited New Orleans for an episode on Build it Bigger about the houses being built under the auspices of the Make It Right Foundation.
This enormous tube tunnel will connect by rail not just the two sides of Istanbul, but two continents. And for an added challenge, they′re building the thing under water.