Watermael-Boitsfort, Belgium, Apr 29 (EFE).- The real mansion house Belgian cartoonist Hergé used as inspiration for Professor Tarragon’’s home in ‘The 7 Crystal Balls’ is on sale for $1.6 million. The 1905 bourgeois villa, which boasts 425 square meters of living space and a vast wooded garden, was designed by architect Alban Chambon for the …