On the campus of the University of the Incarnate Word, you’ll find a 53-acre nature sanctuary run by the Sisters of Charity of the Incarnate Word, who came to San Antonio in 1869 to help with a cholera outbreak and founded the university in 1881. Members of the order also provide educational programs about conservation. This serene spot is popular for its trails, and locals throng here around the holidays, when the campus twinkles with thousands of Christmas lights. Its centerpiece is the San Antonio Springs Blue Hole, the recognized source of the San Antonio River.