In terms of interior decor/furnishings Holyrood really was over the top. As you progress further in your tour, the plaster work ceilings become ever more grandiose. Downside is that you are unable to take photographs. Upside is that there are many willing and enthusiastic docents available to answer your questions.
Very interesting to see where Lord Darnley was murdered in front of Mary Queen of Scots - I know, gruesome, but this is history!
The abbey ruins are also quite compelling. Overall, we are very glad we visited and enjoyed this just as much as Edinburgh castle, perhaps a tad bit more.
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