Chests (23):

• Lilith's Kiss
• Elven Bow
• Chocobo's Wrath (x3)
• White Musk (x2)
• Fuma Garb
• Elixir (x5)
• Phoenix Down (x5)
• Shuriken
• Crystal Mail
• Crystal Gloves
• Crystal Shield
• Crystal Helm

Crystal Tower is probably the longest dungeon in Final Fantasy III.

Once you step your foot on (10), you won't be able to go back, so make sure that you are strong enough before going into the World of Darkness.