Now you're speakin' my language!!!
First, a few classics:
Pantheon, Roma:
Hagia Sophia, Istanbul (not Constantinople):
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And my personal favorite, by Bruce Goff - Ford House in Aurora Illinois. Actually owned by one Sidney Robinson (former architecture professor of mine). Extremely interesting building incorporating odd materials like rope, coal slag, cast glass chunks, bent wide-flange beams, etc. Awesome space inside. He actually bought the lot behind it too just to demo. the house that stood on it and plant 6' high prairie grass to fit the original setting of the building. Expensive way to plant an unmowed lawn!
I could talk for hours about this building but here's a podcast about it by Prof. Robinson:
http://www.prairiemod.typepad.com/prairiemod/2007/10/prairiemod-podc.html#more
I read that he's retiring this year (sad). I hope to sit in on another lecture of his one day!
More Ford House pics: