We went to Buckminster Palace

This malaphor is a word blend, as distinguished from the other malaphors posted up to this point, which are phrase blends.  This is a mixture of Buckingham Palace and Westminster Abbey.   Both are, of course, famous places in London, hence the unintentional misuse.   Buckminster Fuller might also be in the mix, although  “my ‘ol pal” pointed out that many have never heard of him.  Still, you never know what the brain may have picked up and deposited in the unconscious.

This mash up has apparently been used a lot, given the number of google hits.  It even appears in ads by travel agents.