In Teotitlán del Valle, Mexico, a group of unmarried young women and girls gather in front of Preciosa Sangre de Cristo Church after marching in a calenda (parade) for La Fiesta de la Preciosa Sangre. During the parade, the young women wear traditional Zapotec clothing and walk while carrying canastas (baskets) with images of the saints on their heads.

Hear more about Sara Lewkowicz’s experience interning for National Geographic on Proof.