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At an altitude of 3250m and at a latitude of $75^\circ$S, the Italo-FrenchConcordia station was open to winter-over teams in 2005. It is one of the highpoints of the Antarctic polar plateau. These extreme remote sites are expectedto provide exceptional conditions for astronomical observations, specially inthe infra-red ranges, given the very cold winter temperatures, averaging wellbelow -60C. Being very flat as highest points of that very broad polar plateau,they are also not subject to the famous katabatic winds that can be devastatingon the Antarctic coast, and in fact their mean wind speed along the year arethe weakest known on Earth, less than 3 m/s. Besides the resulting absence ofdanger that such winds would present for large size optical instruments, thissituation offers another benefit, which is an excellent free atmosphere seeingabove a very thin but turbulent surface layer. This paper emphasizes theseseeing peculiarities, but not only. It is presented as simply following asignificant fraction of my slide presentation during the meeting.

Some results after 10 years of site testing at Concordia, Antarctica