Long hidden behind other buildings, Stationers’ Hall is one of the largest and most opulent of City livery halls, and they now hold regular public tours.
The Canadian High Commission occupies a newly-renovated grand building overlooking Trafalgar Square, and is not generally open to the public to wander in.
Hidden underneath a mundane office block can be found one of London's largest Roman remains, and it's open for tours from next month.
Fancy a day outside London seeing an underground railway and an underground vault on the same day?
The Modernism in Metro-Land tours are back with a couple of walks in May and June of modernist tube stations.
A Polish tall sailing ship will be arriving in London at the weekend, and they are letting the public on board for a look around.
One of the grandest of the City's livery halls, the Goldsmiths is open a few days a year for public tours and the dates for... next year have been announced.
Not in London (wails!), but in Berlin — where they run a small number of special open-top tours through their underground train tunnels.
Antony Gormley and Dr. Priyamvada Natarajan’s virtual reality collaboration, uses data collected by NASA to map a real and interactive journey, leaving Earth to pass through atmosphere, stratosphere, the asteroid belt, and into outer space.
Reopened last year following restoration, but closed again for winter, Kew Garden's Great Pagoda reopens in April.