Some have incredible original details such as carved doorways and painted ceilings.

BBC: Mini Guide to Buenos Aires, Argentina

The block-long Palazzo was built in 1892 and embodies Italian elegance, with tiled marble floors, hand-painted fresco ceilings and a mix of Moroccan and Baroque flair.

FORBES: An Offer You Can't Refuse: Francis Ford Coppola Opens Italian Hotel

Most of the interiors are just as luxe as the gold pool outside, featuring tile mosaics, hand-painted walls and ceilings frescoes.

FORBES: The Top 10 Homes Viewed on Zillow in 2012

Its mirror-finish black steel skin reflects every passing cloud, giving the building a mysterious totemlike quality, while inside unfinished ceilings are painted deep blue and almost every space can be used flexibly, whether for exhibiting, performances or local events.

WSJ: Zaha Hadid, Farshid Moussavi, Louis Kahn and the Best of 2012 in Architecture