In Superman (vol.2) #210-211, referring to his fortress, Superman says "This is me. This is... Superman". "It's full of fragments of worlds too fantastic to exist... and too magnificently stubborn not to. It's wonderful in the true sense of the word... everything here.. all of it... is part of me".
In Superman II, Kal-El brings Lois to his Fortress and, before making a romantic dinner, Superman tells her how the kryptonian crystals showed him who he was and what he had to do. In a similar manner, in Justice League (vol.3) #14, Superman takes Diana/Wonder Woman to Smallville and shows her the Kent Farm and tells her how the place is relate to the reason he is Superman.
Which place do you prefer to reflect and represent Superman personality? In his shoes, where would you invite your closest friends? Where would you take your girlfriend for a romantic dinner?