Smithsonian.com has a short article taking a look inside the 'House of the Temple' in Washington, D.C. This classic building is the headquarters of Scottish Rite Freemasonry, and is the resting place of Civil War general and Scottish Rite founder Albert Pike. As mentioned in my book, this is likely to be a plot location for The Solomon Key (and Pike's history could well play a part also). There's some information about this in the free sample chapter available here onsite.