Starry Night

 Thierry Cohen's Darkened Cities  project envisions the skies we'd see without air or light pollution.

 

Hong Kong 22° 17' 55'' N 2012-03-23 Lst 14:54

 

New York 40° 42' 16'' N 2010-10-9 Lst 3:40

 

San Francisco 37° 48' 30'' N 2010-10-9 Lst 20:58

Rio de Janeiro 22° 56' 42'' S 2011-06-04 Lst 12:34

See more here.

(via notcot.org)