Revivalism, also known as Historicism, is the main architectural style of the 19th century. It was characterized by the "revival" of all previous architectural styles, and also by a creative combination of them which led to eclecticism. Although being heavily despised by Modernist architects, I believe that we owe this style some of the most famous and also some of the most beautiful buildings in the world.
Neoclassicism (United States Capitol):
http://www.flickr.com/photos/wwarby/2230706526/
Romanesque Revival/Neo-Romanesque (Neuschwanstein Castle):
http://www.flickr.com/photos/josevaldivieso/6325181022/
Gothic Revival/Neo-Gothic (Palace of Westminster):
http://www.flickr.com/photos/76522090@N00/4924013390/
Renaissance Revival/Neo-Renaissance (Vienna State Opera):
http://blog.wienerlinien.at/wp-conte...13/03/oper.jpg
Baroque Revival/Neo-Baroque (Opéra Garnier):
http://static.elegantconcierge.com/i...3787294553.jpg
Neoclassicism (United States Capitol):
http://www.flickr.com/photos/wwarby/2230706526/
Romanesque Revival/Neo-Romanesque (Neuschwanstein Castle):
http://www.flickr.com/photos/josevaldivieso/6325181022/
Gothic Revival/Neo-Gothic (Palace of Westminster):
http://www.flickr.com/photos/76522090@N00/4924013390/
Renaissance Revival/Neo-Renaissance (Vienna State Opera):
http://blog.wienerlinien.at/wp-conte...13/03/oper.jpg
Baroque Revival/Neo-Baroque (Opéra Garnier):
http://static.elegantconcierge.com/i...3787294553.jpg