Knole House Attic Tour
Starting earlier this year, Knole House in Sevenoaks, Kent have introduced attic tours of this grand home. You have to book and pay a fee (even for National Trust members) but it is well worth a few extra shackles to see something different.
Led by excellent guides, the tour is 45 minutes and covers three main rooms where you will discover ancient graffiti, centuries old letters and witches' marks. You are not allowed to take photographs which is a real shame, so here's a link to the National Trust website for further details. Knole Attic Tour