Felicjan Czarnota
Felicjan Czarnota voted up Yo Kass' answer

Interesting question!

I quite like "Il Vittoriano" in Rome's Piazza Venezia.

Even though it's kind of controversial because it's glaringly white and an entire neighborhood that had been around since the Middle Ages was levelled in order to build it.

It was originally built as a symbol of a unified Italy.