That's right folks, it's almost upon us again - the superb Open House London event runs for just one weekend each year and gives visitors and residents alike a unique opportunity to – as the event's website puts it – "get out and under the skin of London's amazing architecture."
Some events are free, some you need to shell out a few quid for, but one thing's for sure: there's something for everyone.
This year, more than 700 buildings in the capital will be opening their doors to the public, some for the very first time.
Whether you're an architecture student or simply have a passing interest in the structures that make up the city of London, Open House London can make for a great afternoon out – or whole day, or even weekend, if you plan it right.
Taking place on 22nd and 23rd September, many events need to be booked in advance, so the advice is to hop along to its website early to be among the first to peruse the impressive offerings.
Alternatively, you can purchase a printed guide for £6.50 from here.
Besides entry to buildings, a number of special events are also held each year, including the London Night Hike.
Taking place on the Friday before the main event kicks off, the Night Hike this year welcomes a colossal 2,000 walkers (register online here). Two courses are offered – a 10-mile route and a 20-mile one, so yes, you'll need some stamina besides your comfortable walking shoes.
The walks take in some of London's finest architecture, including Royal Festival Hall, the Royal Geographical Society, and Horse Guards. For more information on the walk, click here.
Be sure to make the most out of Open House London – it only comes around once a year.