Time for the 5th riddle. 
By now many of you have guessed the pattern of the riddles
Before I give the riddle I want to repeat the rules of the game
When you have the answer, send the answer to me in a personal message.
Do this for each riddle and you will be eligible for the prize.

Please, if you guess it do not give the answer in a comment as it will spoil the competition for others.

With that lets look at todays riddle

In a sprawling land where dreams ignite,
A city of angels, both day and night.
Where a sign on a hill spells fame and delight,
And stars on the ground shine in the light.
From a tar pit’s depths to a planetarium’s height,
Name this city where the sun sets in the west’s twilight.