Useful website:
RIBA https://www.architecture.com
Top architect practices:
Norman Foster http://www.fosterandpartners.com/
Zaha Hadid http://www.zaha-hadid.com/
Sheppard Robson http://www.sheppardrobson.com/
BDP http://www.bdp.com/
Renzo Piano http://www.rpbw.com/
Make Architects http://www.makearchitects.com/
Other sources...
http://www.archdaily.com/search/projects
http://www.houzz.co.uk/
RIBA https://www.architecture.com
Top architect practices:
Norman Foster http://www.fosterandpartners.com/
Zaha Hadid http://www.zaha-hadid.com/
Sheppard Robson http://www.sheppardrobson.com/
BDP http://www.bdp.com/
Renzo Piano http://www.rpbw.com/
Make Architects http://www.makearchitects.com/
Other sources...
http://www.archdaily.com/search/projects
http://www.houzz.co.uk/