The Bible, the Mona Lisa, the works of Scott Joplin, the Star-Spangled Banner, Ivanhoe, Little Women...there are literally millions if not billions of examples.
Virtually everything published before 1923 is in the public domain as well as many works published before 1964 and not properly renewed or permitted to lapse
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The King James Bible. Alice's Adventures in Wonderland. Encyclopedia Brittanica, 1911 edition. All U.S. government works: USGS maps, GPO publications produced by...
The most popular example of software in the public domain is SQLite. There isn't too much software in the public domain, as most of it is licensed under a very permissive free software license, like...