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The actual labs where Bardeen, Brattain and Shockley invented the transistor in 1947 are some way north of here, but this is much more in keeping with the sightseeing ethos. It's a 60-foot water tower, erected during the building of new labs in 1961, in the shape of a giant three-legged transistor. If an Intel quad-core Xeon was built with transistors that size, it would be around 150km per side. In other words, it would cover an area bounded by London, Bristol, Birmingham and Peterborough.
Real-life visiting potential: 8/10. (Would be 10/10 for the entire Xeon).
Now a veterans' rehabilitation home, in 1975 it was the Sundowner Motel, and the temporary home, according to at least one account, of young Bill Gates and Paul Allen. This was the place where they polished off their first microcomputer BASIC, for the 8080A-based Altair 8800, before setting up Microsoft in shared office space nearby. Although MITS, the company that built the Altair, was supposed to get the rights to the BASIC after a certain amount of royalties had been paid, there was some disagreement as to whether this happened. Gates and Allen won the subsequent arbitration and kept the rights to the BASIC, which was Microsoft's main money-spinner until MS-DOS.
Real-life visiting potential: 2/10, unless it's been a bad war.
For a company that couldn't market its way out of a paper bag nor plan a strategy to save its life, Acorn has done remarkably well in the afterlife. On the back of the phenomenal success of the BBC Micro in the early 1980s, the famous NIH (Not Invented Here) spirit of the Cambridge computer community made the company turn its back on other processors and build its own, the Acorn Risc Machine. The subsequent line of Archimedes PCs flopped, but the ARM chip turned out to be just the thing for embedded computing. With around 75 percent of 32-bit embedded chips worldwide, ARM can afford posh offices in the Cambridge countryside.
Real-life visiting potential: 5/10. Check out Cambridge instead, where they invented the electron in a rather nice pub.