greatbuildings
awesome collections of famous buildings, palaces of the world

suurland
some good quality sketchs of notre dam cathedral Rome

amazingplans
this site got some orthographic drawings of the exterior

englandhouseplans
this one got some good drawings

newhomesource
you can search by state through this site, a unique

jetlink
if you are looking for information on gothic architecture

teacheroz
a huge site listing architeture and sculpture of various period

depauw edu
a informative site on roman art and architecture

Architecture Web Sites
best one stop site to go for if you are studying architecture

Top Arts Architecture
famous palaces of various parts of the world are listed here

bluffton edu
if you are a fan of Antoni Gaudí style, this site is for you