St. Stephen's Cathedral has numerous formal chapels, including the baptismal chapel, St. Katherine's Chapel, which is located at the foot of the south tower. St. Barbara's Chapel, located at the base of the north tower, is a place of reflection and prayer. The southeast corner's St. Eligius Chapel is open for prayer. The cathedral also has two memorial chapels: one dedicated to those who died in World War II, the other to victims of the September 11 attacks. The cathedral is open daily from 8:30 a.m. to 5 p.m.; during these hours, it is accessible to people with mobility issues. A free audio guide is available throughout the building in English, French, Spanish, Chinese, Japanese, and Korean. There are several ways to take advantage of St. Stephen's Cathedral's amenities: you can sign up for a guided tour; attend one of the many services offered each week; or just drop by and pray at one of the many chapels. Please note that due to health regulations, there is no smoking allowed inside the cathedral. St. Stephen's Cathedral is one of Chicago's most beautiful buildings and worth visiting even if you're not planning on going inside. It was built between 1904 and 1911 in Gothic Revival style and is considered by some to be the work of the greatest master of that style in America, George M. White.