The week's best photos

In this Feb. 23, 2012 photo, a woman looks down from the staircase in the occupied Prestes Maia building in downtown Sao Paulo, Brazil. Occupied in 2002 by about 350 homeless families, the building lacks electricity, elevators and running water. The families are part of Brazil's "roofless" squatter movement that's been around for years and hasn't abated despite the nation's economic boom. Squatters say their meager incomes, often earned in Brazil's informal economy, would never allow them to afford rent, even in slums. (AP Photo/Andre Penner)