Addendum
As indicated earlier, the best way would be to look for a suitable Apple Macintosh CRT monitor (approx. 1990-1995) with a DB-15 plug. However, these monitors are not always easy to find today.
An old PC-style VGA CRT monitor should be easier to locate (Mac-to-VGA adapter needed). LCD monitors with a VGA connector will require testing (may or may not work).
Many flat-screen television sets have a VGA connector (also known as D-Sub) in addition to HDMI. Mac-to-VGA adapter needed and testing required.
Old CRT television sets may have a VGA connector (but it is unusual).
Otherwise, depending on where in the world you are, a CRT TV could have composite (yellow RCA) or SCART connectors (or both). If absolutely necessary, it may even be possible for the experimentally inclined to adapt a standard DB-15 Macintosh video output to one such TV input.