Seeking Interesting Sites When Travelling the World?

An anonymous reader asks: "Is there anyone besides me who likes to travel and look at engineering projects? When I first read Neal Stephenson's Wired article on his trip around the world to watch an intercontinental fiber cable being built from England to Japan (still available at HotWired) I knew this was what I wanted to do with my vacation days. Space launch sites, high-speed rail lines, container ports, technology museums - I've tried them all. Does Slashdot have suggestions for destinations, or for web sites where people share their experiences."