Given the following context:

Funerary art tends to be conservative in style, and many grave markers in various cultures follow rather traditional patterns, while others reflect modernism or other recent styles.  Public monuments representing collective memorials to particular groups of dead people continue to be erected, especially war memorials, and in the Western world have now replaced individual or family memorials as the dominant types of very large memorials; Western political leaders now usually receive simple graves. Some large memorials are fairly traditional, while those reflecting more contemporary styles include the Vietnam Veterans Memorial, and several Holocaust memorials, such as Yad Vashem in Jerusalem, the Vel d'Hiv Memorial in Paris (1994), the Memorial to the Murdered Jews of Europe in Berlin (2004), and the Judenplatz Holocaust Memorial in Vienna (2000). These are in notable contrast to the style of most war memorials to the military of World War II; earlier modernist memorials to the dead of World War I were sometimes removed after a time as inappropriate.  Some war memorials, especially in countries like Germany, have had a turbulent political history, for example the much-rededicated Neue Wache in Berlin  and the Yasukuni Shrine in Tokyo, which is internationally controversial.Several critics detect a crisis in public memorial style from 1945, when the traditional figurative symbolic language, and evocation of nationalist values, came to seem inadequate, especially in relation to genocide, at least on the Western side of the Iron Curtain. In the Communist East the established style of Socialist Realism was still considered appropriate, at least by the authorities. The generation of abstracted and conceptual war and Holocaust memorials erected in the West from the 1990s onwards seems finally to have found a resolution for these issues.Many large mausoleums have been constructed for political leaders, including Lenin's Mausoleum and those for Atatürk, Jinnah, Kim Il-Sung, Che Guevara and several Presidential...

answer the following question:

What people usually have a library and museum as their largest commemorative memorials? 

presidents