"The whole city burned down."

Translation: Hele byen brant ned.

[user_ken]

Can some one explain why when the adjective is "hele" the sentence doesn't take "den" to start? I would expect the translation of this sentence to be "Den hele byen brant ned"

[Deliciae]

"Hel" and "halv" are strong and independent adjectives, which need no definite article.
They're an exception to the rule. :)