Who doesn't remember his or her first trip to the circus? The magical performances under the big top, scents of peanuts and popcorn, parade of animals, flying trapeze artists and, of course, the clowns. From the ancient circus day in Pompey's Rome to today's “Greatest Show on Earth,” the circus has entertained millions and provided livelihoods for countless men and women all over the world. If your ancestor jumped aboard a circus train or spent time in the carnival tent, use these tips to find out more.

Learn the big-top backstory. The first American circuses began shortly after US independence, and circuses became a popular source of entertainment during the 1800s. At the beginning of the 20th century, more than 100 circuses were traveling around the country, performing for nearly 12,000 spectators at each stop. Get a crash course in circus history and lore at <www.circushistory.org> and <www.ringling.com>. You can learn P.T. Bamum's genealogy at <www.barnum.org> and read how the Ringling Brothers got their start at <www.ringling.com>.