There is no place like Montmarte. The atmosphere is just amazing and what one imagines it to be. Much more laid back than the central parts of Paris, more artistic and easy going. The older parts on the hill is quite cramped and narrow, covered in cobble stones and just adds an extra dimension to the artsie feel of it.
The buildings may not be unique, but the whole feel to this part of the metropolis and the history of bohemian culture is why it holds a unique place in my heart.
Nikon D80 with Sigma DC 18-50mm 1:2.8 EX MACRO HSM