As Heather and Jon Blumberg wandered up the steep Bolivian streets from Iglesia de San Francisco, a church built in 1549, things got a bit confusing. They tried to follow the map in the La Paz guidebook, but it wasn't working out. Then, a telltale sign started showing its face--literally. "When we started seeing llama fetuses, we knew we must be close," says Heather.