Take part in a treasure and trivia hunt across Central London, taking in a host of railway-related locations.
This coming Saturday will give you a chance to go on board a Royal Navy ship moored in Docklands for a look around.
For one evening this week, it will be possible to cycle around the massive Kew Gardens as part of a special evening event.
Following a lengthy restoration, the Grade II listed Oxford House in Bethnal Green, London will be open to the public for a series of film screenings in its attic Chapel and Theatre.
A short trip outside London is a huge silver UFO shaped building, and in August will be a chance to go inside to see the particle accelerator it houses.
There's a chance to go inside the palatial Lloyds Register building in the City of London.
At the end of this month, the famous bridge will mark it's 125th anniversary, and is offering entry for just £1.25 all weekend.
Experience the Apollo 11 mission on one of the biggest cinema screens in Europe - the Science Museum's IMAX, followed by a Q&A with British astronaut Helen Sharman and legendary science broadcaster James Burke.
After a lengthy restoration, the Cally Clock Tower opens to the public next month, and tickets to climb up to the top are now available.
During the evening you will meet members of the Big Ben team and find out about the history and the workings of this famous clock tower.
For a few days this summer, the restored gardens of Spencer House in central London will be open to the public.
A former cinema turned bingo hall in Tooting is remarkable for its exceptional interior, and next month there will be a chance to go on a tour of the building.
A site that is famous as much for its architecture as the animals within, London Zoo is now offering history tours of the site.
The Postal Museum is marking the bicentenary of the birth of Queen Victoria by offering free entry to the museum -- if your name is Victoria.
A fairly grand building of the city livery companies style, and while public tours used to be very rare, they are now a fairly regular affair.