Among its ten main meeting rooms are Edinburgh Hall, modeled after the Tudor-style Rosslyn Chapel in Scotland, and another which resembles an Egyptian temple.
In 2005, the Mitchell's received media coverage from Reuters, ITN, BBC, and CNN/Fox News when they claimed to have deciphered a musical code carved into the ceiling design of Rosslyn Chapel.
Lady Westmorland died at 58 Queen Anne’s Street in Marylebone, London on 21 July 1910, aged 39, and was buried in the Rosslyn Chapel.
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Composer Stuart Mitchell and his father T.J. Mitchell claim that Rosslyn Chapel's carvings contain references to Cymatics patterns.
Christopher Knight and Robert Lomas speculate in their 1996 book The Hiram Key that the construction of the Rosslyn Chapel in Scotland (1440–1490) provided the interface between the Knights Templar and Freemasonry.