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Open House London is a city-wide celebration of the buildings, places and spaces where we live and work. The year 2012 is the 20th anniversary edition of Open House London and of the Open-City organisation as a whole

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The festival will provide a unique opportunity to see, explore and learn about London's amazing architecture and design over 48 hours. More than 750 buildings of all kinds will open their doors, alongside a programme of neighbourhood walks, engineering and landscape tours, night-time openings, urban jogs and experts' talks - all for free.

This year's theme 'The Changing Face of London' explores issues that are relevant to local communities - including the design of homes, the impact of climate change, the role of architects and contemporary design in revitalising places, and above all showing how good design can make London a more liveable, vibrant and enjoyable city.

Highlights include:

• Iconic landmarks and towers including 30 St Mary Axe (aka the Gherkin), Heron Tower and Tower 42
• London's infrastructure revealed with the Institution of Civil Engineers - including rides on the new Emirates Airline cable car, boat tours to the Thames Barrier and the Hoo Peninsula, engineering walks and site visits to major construction and engineering sites
• East London Transformation - discover all about the transformation of East London and the Lea Valley with expert-led events showcasing the regeneration of areas surrounding the Olympic Park
• Nearly 50 projects with landscape at their heart with the Landscape Institute - including the newly landscaped Granary/King's Cross and Leicester Square, and the vast green roofs and insect hotel at 20 Triton Street
• Several open Embassies with the British Council's International Architecture and Design Showcase
• Showcase of 100 private homes, Architects' homes and groundbreaking housing developments - from contemporary award-winners to vintage 50s and 60s designs
• Speak with planners, architects and engineers on how they create successful buildings and cities
• Maggie's and Open House London Night Hike on Friday 21st September - a moonlit walk through London with the opportunity to see Open House architecture and raise money for Maggie's Cancer Caring Centres
• Activities for kids and families, from architectural model-making to quiz trails

Website: www.openhouselondon.org.uk