Definition of vistas:
(n) :
A distant view or prospect, especially one seen through some opening, avenue or passage.
(n) :
A site offering such a view.
(n) :
(figuratively) A vision; a view presented to the mind in prospect or in retrospect by the imagination.
(v) :
(transitive) To make a vista or landscape of.
(n) :
A city in San Diego County, California, United States.
(n) :
(computing) Ellipsis of Windows Vista.