odditorium
A shop or museum exhibiting unusual curiosities.
[…] and we found passageways with queer, quaint gables, and in a draper's shop, and in constant daily use, we came upon an ancient and beautiful oak staircase really fit for a palace, and we happened upon an "odditorium," […]
Where it comes from
Blend of odd + auditorium; mainly used by the franchise of Ripley's Believe It or Not!.
Adapted from the Wiktionary entry odditorium (CC BY-SA 4.0).