The House of the Royal Society for the Encouragement of Arts Manufactures and Commerce. Foundation Laid 28 March 1772 Complete 24 April 1774 Robert & James Adam Architects.

See also...
Spudgun67 on Wikimedia Commons
Nick Harrison on Flickr
Nick Harrison on Flickr
Simon Harriyott on Flickr
Steve Cadman on Flickr
gnomonic on Flickr