Every year many buildings across the capital city open their doors for a weekend to allow people to see inside.
On September 22nd and September 23rd, around 750 top landmarks including Tower 42 and the Heron Tower will take part in the event organised by Open-City.
At all of the Open House properties, people will be able to talk to guides who can explain more about the buildings to find out about the ideas and inspiration behind the architecture.
One of the main focuses of this year's Open House event is on the creation and regeneration of London's landscapes. Included in this category is the Walthamstow Wetlands, the transformed railway lands of King’s Cross and the Grenville Community Gardens in Islington.
"Investment in landscape is changing the face of London and delivering exciting social, environmental and economic benefits," said a spokeswoman for the event.
"This year’s festival will be unprecedented in breadth, scale and reach."
There are also chances to ride on the new Emirates Airline cable car, take boat tours to the Thames Barrier and find out more about the creation of the London 2012 Olympic Park.
Admission to the buildings involved in the Open House is free but tickets do need to be booked as entry numbers are strictly limited, so those planning to combine tours with a stays at central London hotels should act quickly.
There is also a programme available for the event that reveals more about the planned events and the buildings and spaces across the capital taking part in the Open House scheme. This can be purchased from the organisers or picked up from libraries across London.