Preheat oven to 350 degrees. Generously butter bottom and sides of 9x13" pan. Set aside.
Chop nuts and combine with cinnamon, cardamom and nutmeg. Set aside.
Unroll phyllo dough and cover with a damp cloth to prevent drying. Keep it covered while working. ( It dries out very quicky!)
Place two sheets of dough in the pan and brush thoroughly with melted butter. Place eight sheets on top of this and brush with butter. Sprinkle 2-3 tablespoons of nut mixture. Place sheets of dough on top of nuts and brush with butter. Repeat until the top layer is only phyllo.
Cut dough into diamond shapes with diagonal cuts--minimum 40 pieces up to about 55 pieces.
Bake for 50 minutes, until golden.
While baking, make the syrup by combining sugar and water in a small saucepan and cook until boiling. Add honey and vanilla and let simmer for 20 minutes.
Remove baklava from oven and immediately spoon hot syrup over the top. Let cool completely.
Let baklava sit uncovered until served. Best eaten the same day as baked or frozen for future use.