TIL people in Valencia speak several different versions of Spanish: http://gospain.about.com/od/learningspanishinspain/p/valenci...
"In Valencia they speak a form of Catalan (the locals call it 'Valenciano' but this is not officially recognised anywhere outside of Valencia).
Everyone in Valencia speaks Castillian Spanish, but many will speak to each other in Catalan in the street. This will be a bit of a hindrance to your learning experience."
"You will mainly hear Catalan in the streets of Valencia, not Castillian Spanish. Even road signs and advertisements are in Catalan. You will find newspapers, TV and radio in both languages."