It depends on what context it's being used in.
For example: The World Trade Center was centered around two twin towers...
Here you wouldn't need to capitalize them because they're not being used as proper nouns. They're just a type of building that you're describing.
However, if you were to say:
The day the Twin Towers were destroyed will be forever remembered.
You need the capitals because you are referring to two specific buildings and the phrase is being used as a name, thus making it a proper noun.
The petronas twin towers.
you can get the twin towers into fsx by downloading it or setting the settings for fsx to realistic
the man who walked the twin towers was a frenchman named phillipe pettit who walked the towers in 1974
No, they werent. The tallest towers were the Petronas towers.
Twin Towers were first, then Pennsylvania, then the Pentagon.
The twin towers were never rebuilt or renamed. They are still simpily called the twin towers.
twin towers
* he was a cleaner in the twin towers
the twin towers were 110 stories tall.
Osama bin Laden did and name the twin towers
The petronas twin towers.
osama bin laden did and name the twin towers
lots 1 the twin towers
The Twin Towers no longer exist.
there going to build the twin towers in 2015
yes they Will make the twin towers again
Acico Twin Towers was created in 2008.