Preserved for Posterity
In this picture, Maduro, first left, Brazil's former President Luiz Inacio Lula Da Silva, second left, Brazil's President Dilma Rousseff, third left, and Hugo Chavez's daughter Rosa Virginia mourn next to the glass-topped casket containing Chavez's remains at the military academy in Caracas March 7, 2013.
In this picture, Lenin addresses his supporters celebrating the first anniversary of Bolshevik revolution in Moscow in October 1918.
You can take a virtual tour of the famous mausoleum here.
After his death in 1976, the Communist Party chairman's remains were embalmed and put on public display.
In the 1970s, Evita's preserved body was found, restored and briefly displayed a second time before finally being laid to rest in a fortified crypt.
Read more: North Korea unveils Kim Jong Il's embalmed body
In this picture, former first lady Imelda Marcos kisses the glass casket of her dead but unburied husband March 26, 2010.