10 unoperational operating theaters

The distinction between early anatomy lecture theaters which dissected the dead and later operating theaters, which attempted to cure the living, is blurred. Both were used for teaching, in broad daylight where lecturers clothes became stiff with blood and the air thick with germs.

With highly unusual steep raked galleries these were literally theaters, and the name has stuck. The earliest rooms were often heavily decorated such as the beautifully restored 16th Century wood paneled anatomy theater at the University of Bologna to the crudely utilitarian 19th century dedicated operating theater at St. Thomas’, London.

 
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The world's second anatomy theater.
The Ether Dome was the operating room of the Bulfinch Building at Massachusetts General Hospital in Boston, built in 1846.
The oldest operating theater in the US, predating Jefferson's Anatomy theater at the University of Virginia, which was demolished in the 30s.
Said to be the world's oldest operating theater (as distinct from the earlier ones which were for dissection).