Plaza de Espana - particularly liked the tower, but overall could be cool plaza inspiration for southern gondor.
Tower of the Seville Cathedral - Moorish architecture for umbar/harad
Pretty ideal layout for a town
I actually reconstructed that in Google Sketchup once, Cluny is amazing, used to host one of Europe’s largest libraries until it burned down. http://blog.kudoybook.com/wp-content/uploads/images/Cluny.gif