Non-profit organisation responsible for OPEN HOUSE Athens & OPEN HOUSE Thessaloniki events. Open House is a simple but powerful concept: showcasing outstanding architecture for all to experience, completely for free. Open House initiatives invite everyone to explore and understand the value of a well-designed built environment. The Open House event started in London in 1992, gaining in the past 20 years a lot of appreciation and support. Today 21 cities are members of the Open House Worldwide family and host annually this event, including New York, Dublin, Tel Aviv, Jerusalem, Helsinki, Melbourne, Barcelona, Chicago, Rome, Lisbon etc.