José Clemente Orozco
David Alfaro Siqueiros
The UNESCO World Heritage Centre identifies natural and cultural sites of global significance so that they may be preserved for the benefit of humanity. Sites listed include photographs and descriptions of their significance.
The Heilbrunn Timeline of Art History from the Met is an excellent resource with images, essays and chronologies of art.
Google Arts & Culture features content from over 1000 leading museums and archives who have partnered with the Google Cultural Institute to bring the world's treasures online.
The national art museum of Mexico, with hundreds of works viewable online.
Art museum in Buenos Aires, Argentina.
The largest art museum in Brazil.