Michel Foucault's Questions on Geography and Space, Knowledge, and Power

Foucault, Michel. 1980(1976) "Questions on geography." Power/ Knowledge: Selected interviews & other writings 1972-1977. Edited by Colin Gordon. NY: Pantheon.
Foucault, Michel 1994(1982). "Space, Knowledge and Power." In Power: Essential Works of Foucault 1954-1984. Edited by James D. Faubion. NY: The New Press.

Why was Foucault so obssessed with metaphors of space?

What are the implications of "space" for Foucault?

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What is the importance of architecture to the politics of eighteenth century?

What is the difference between the 18th and 19th century, in terms of the relationship between space and power?

Why isn't there any architecture or space liberating, according to Foucault?

"Sex ... was inscribed in the center of the cities. It was public; it served a purpose... " Could you explain?