The Library of Congress Web site has some very interesting online exhibits. 

http://www.loc.gov/exhibits/

Some of these would be very good for a research paper.  Let me call your attention to Religion and the Founding of the American Republic where you can see this picture:

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Execution of Mennonites
This engraving depicts the execution of David van der Leyen and Levina Ghyselins, described variously as Dutch Anabaptists or Mennonites, by Catholic authorities in Ghent in 1554. Strangled and burned, van der Leyen was finally dispatched with an iron fork. Bracht’s Martyr’s Mirror is considered by modern Mennonites as second only in importance to the Bible in perpetuating their faith. (from the LOC Web site) 

AND MUCH MORE!!!