Originally, a day out where one would sign up for a trip headed to an unknown destination. The Beatles' Magical Mystery Tour film gives a little idea of what this was like (normally minus the surrealism and rock music, of course). The Book of Heroic Failures records an English couple who were on holiday in Wales, took a mystery tour bus starting in Wales, and ended up back in their own English hometown unexpectedly.

Now, often used for poking around an unfamiliar web site or just following links randomly.

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