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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.