A Beautiful Piece of Architecture

I'm not really sure what qualifies as a truly beautiful piece of architecture, but in my opinion, my favourite would have to be... 

The American Radiator Building, or as it's known now, The Bryant Park Hotel. 

 
Built in 1924, the building was a grand departure from the pre-existing architecture of New York City in the Roaring Twenty's. The architect, Raymond Hood, broke away from the traditional Beaux-Arts architectural style and instead created a truly innovative building. The design of the building infuses both Art Deco and Gothic art styles. The deep black of the building represents coal, and the gold is symbolic of fire. I find this a truly beautiful piece of architecture because of two points. Firstly, it attains a truly timeless manner through it's appearance - the unconventional use of bold hues and infusion of modern and gothic art styles makes it a truly unique and striking building. Secondly, it holds historic importance to me because the building is a shining testament to the grandeur, prosperity and power of New York in the Prohibition, before the fall of Wall Street on Black Tuesday.