[2][3] It is named after Big Ben, the nickname of the clock tower of the Palace of Westminster in London.
Building on the outer circle is down by suit, while the foundations in the inner circle are built up by suit until the last card corresponds to its position on the clock (i.e. the Q♠ should be built up to 7♠, for instance).
Building on a pile having cards less than three is like "filling a gap" from the tableau and is therefore not allowed.
But once the stock is exhausted, there are no re-deals; the game ends sooner after this or later.
Big Ben is a large-scale, two-deck version of Grandfather's Clock.