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.
Good Grief, Charlie Brown! – 25 Oct 2018 to 3 Mar 2019 – Fans of Charles M Schulz much-loved Peanuts cartoon will want to see the Charlie Brown and Snoopy exhibition at Somerset House.
Somerset House Historical Highlights – Every Thu and Sat – This tour has tales about Tudor intrigues and the extravagant entertainments laid on during Georgian times
Guided walk around Charles Dickens’ London – Every Fri – This guided walk will take you around some of the most memorable streets and locations that Charles Dickens used in his novels.
11 — London’s cheapest sightseeing bus – Every day – If you don't fancy spending money on an open-top sightseeing bus, then there's a cheaper alternative — the No 11 bus.
City Highlights: The Top 10 sights – Every Mon, Wed and Sun – A two-hour guided walk around the Square Mile, showing you some of the most famous historical sites and buildings in the City of London.
Mansion House: The Lord Mayor’s Residence – Every Tue – Look inside the Lord Mayor of London's official residence at Mansion House and see the interior courtyard and famous Egyptian Hall.
Guided tour of Wren’s best churches – Every Tue and Thu – This guided walk will look at the outside of St Pauls Cathedral and at a selection of Christopher Wren's finest City churches
Look for more Royal events taking place in February
Look for more guided tours in February
Here are some more free events in London if you want a cheap day out