Gargoyles, or more precisely chimera, were used as decoration on 19th and early 20th century buildings in cities such as New York (where the Chrysler Building's stainless steel gargoyles are celebrated), and Chicago. Gargoyles can be found on many churches and buildings. One impressive collection of modern gargoyles can be found at Washington National Cathedral in Washington, DC. The cathedral begun in 1908 is encrusted with the limestone demons. This collection also includes Darth Vader, a crooked politician, robots and many other modern spins on the ancient tradition. The 20th Century collegiate form of the Gothic Revival produced many modern gargoyles, notably at Princeton University, Duke University and the University of Chicago.