This cover from Brazil is full of history: the main stamp commemorates a Candomblé site in the state of Bahia. Candomblé is an African-Brazilian religion that goes back to the days of slavery in the Americas.
Prevented from continuing their own religion, slaves disguised their worship under cover of the prevailing religion (Catholicism). The sites where these covert religions were sustained are now heritage sites in Brazil. For more information, click here to read an article from Brazil Travel.
The site commemorated on this stamp (upper-right) is Ilé Axé Opô Afonjá, in the city of Salvador, in Bahia state. The cover also carries a commemorative cancel.
Date: 13th August 2013
In the upper-left corner, the cover also carries two stamps (definitives, I think), featuring everyday crafts and occupations, illustrated with designs by Brazilian artist Hector Consani.
Thanks to Marcio for this cover.