Douglas Harper's Etymology Dictionary
odditorium
1914, from oddity + -orium (see -ory).
Wiktionary
odditorium
n. A museum exhibiting unusual curiosity.
Usage examples of "odditorium".
This was all in the Third, or Sheet-Metal, Age of Lower Middle Earth, and the lands of that age have long since dropped into the sea and their inhabitants into bell jars at the Ripley's Believe-It-or-Not Odditorium.