After starting in London in 1992 and spreading to cities across the world, Open House takes place in Athens every spring and this year will be held over the weekend of March 31 and April 1.
The Open House project invites the public to explore and understand the value of architecture. Every year for one weekend, private and public buildings open their gates to everyone for free and the city is transformed to a big museum, with its buildings and architecture being the exhibits.
Free tours will be held in 92 buildings of extraordinary architecture, along with other events. The tours are done by volunteers.
More info at http://www.openhouseathens.gr/en/