Center of power for the Aes Sedai. The south entrance is Tarlomen's Gate. The west entrance is the Alindrelle Gates. The west entrance is the Sunset Gate??
NS,Ch4 – The western entrance to the White Tower is the Sunset Gate.
NS,Ch9 – The chamber of the oval ring and the test for the shawl is in the lowest level of the White Tower.
NS,Ch13 – The White Tower has its own bank where many Aes Sedai deposit their annual stipend.
NS,Epilogue - As Moiraine and Lan leave to continue the search, Siuan heads back to the White Tower to continue working with the Blue Ajah eyes-and-ears.
TFoH,Ch51 - Two very different letters from Elaida and Alviarin make Rand think that there is a rift in the White Tower. The White Tower certainly has spies in Cairhien for news of his presence to have gotten back so fast.