Royal Bank Plaza, Toronto

If you could somehow steal this plaza you would walk away with more than a million dollars worth of gold. Each of the 4,000 windows (the most of any building in the world) has gold baked right in, acting as a heat insulator for the two towers. The building, completed in 1977, is home to many shops and services, from upscale fashion to bookstores and the unique Wonderful & Whites shop. The towers (one 41 storeys, the other 26), linked by a glass walkway, are situated above the PATH system and are therefore easily accessible from underground.