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Somerset House always lays on a couple of free walks each week. The first one is called the 'Old Palaces Tour', which explores the history of the site before the current building even existed.
In recent years this site has been home to a tax office and an art gallery, but in the past it used to house three of the Stuart queens: Anne of Denmark, Henrietta Maria and Catherine of Braganza.
The tour will also include a look inside the usually inaccessible Strand Lane Bath. Guidebooks refer to this as a Roman Bath, but it's now believed to be a water cistern that fed the plants in Somerset House. (Craig has been to see these so-called 'Roman Baths' himself, and written a review on his blog.)
Note: If you're more interested in the architecture then you might prefer their other free tour: Historical Highlights at Somerset House.
Visit the State Rooms at Windsor Castle – Every day – Visit the State Rooms at Windsor Castle, the world's oldest inhabited castle, and the Royal Family's home for over 1000 years.
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