Devil May Cry - The place where Dante fight Nelo Angelo the 1st time,the ghost ship,Devil May Cry (Shop),the place where Nightmare appeared,the place where Blades appeared (an open ground or some sort),and the place where Frosts first appeared.
Devil May Cry 2 - Hell,that's it (The Despair Embodied battle).
Devil May Cry 3 - Cerberus' resting place,Agni and Rudra area,Nevan's area (who doesn;t),Temeni-gru's top floor,where Dante fought Vergil the first time in this game(An epic location for an epic fight).
Devil May Cry 4 - The Order of the Sword HQ,Echidna's forest,the place where Frosts first appeared (snowy mountains), and the place where Dante fights Saviour.