This unique structure combines two completely different functions in one. What are they?

 

Out of necessity it was built 150 feet above sea-level. Do you know where it is?

 

It was designed by one of the most eminent church architects. Who designed it? When was it built?

 

Among other things it was a monument to changes in attitude towards health and personal hygiene. Why is that?

 

What in the world is this?

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