On World Of Wizards Online you will find many different worlds to explorer as your levels get higher.
All worlds will have Mobs at different levels
Here is a list and link to them.
Atlantis - A HUB For Your Second Life (No Monsters)
Terra - Home Of The Citizens. (Monster Level 1-10)
Phlegethon- The Seventh Circle of Hell. (Monster Level 1-20)
Tartarus - The Place Where Sinners Are Sent (Monster Level 10-20)
Asphodel Meadows - Where Ordinary Souls Are Sent To Live After Death. (Monster Level 20-40)
Elysium - The Isles Of The Blessed (Monster Level 40-70)
Home Of Boreas - The Bringer Of Winter (Monster Level 70-100)