His first professional performance is thought to have been at the Pasadena Athletic Club in New York.
There's a small Houdini museum in Scranton, Pennsylvania. The Library of Congress in Washington, D.C. and the University of Texas in Austin hold collections.
There are commercial museums at Houdini's Magic Shop in Las Vegas and Fantasma Magic in New York. Magician David Copperfield has a private collection.
The Museum At The Castle in Appleton also has exhibits. Its gift shop sells straitjackets. But no butter churns or manacles.
"We hope to hear from Harry soon," says Boldt. "He might make his comeback if he knows it's a sellout crowd.
"He was the ultimate showman. He once said that only when people were sure he was licked would he appear. He was a master of suspense."
This year's Houdini séance takes place October 31 at the Halifax Citadel National Historic Site and is open to the public; entrance fee $45; more information at this leading Houdini fan site.
Numerous Houdini artifacts can be seen at the History Museum at the Castle in Appleton, Wisconsin.