In ancient Rome, the architectural feature called a vomitorium was the entrance way through which crowds entered and exited a stadium, not a special room used for purging food during meals. Vomiting was not a regular part of Roman dining customs.
Stairwells in medieval castles curved very narrowly and clockwise. Attackers coming up the stairs had sword hands (right hand) against the interior curve of the wall and made it very difficult to swing their swords. Defenders had their sword hands on the outside wall giving much room to swing.