Vimana is the structure over the garbhagriha or inner sanctum in the Hindu temples of South India and Odisha in East India. In typical temples of Odisha using the Kalinga style of architecture, the vimana is the tallest structure of the temple, as it is in the shikhara towers of temples in West and North India. By contrast, in large South Indian temples, it is typically smaller than the great gatehouses or gopuram, which are the most immediately striking architectural elements in a temple complex. A vimana is usually shaped as a pyramid, consisting of several stories or tala. Vimana are divided in two groups: jati vimanas that have up to four tala and mukhya vimana that have five tala and more.
In North Indian temple architecture texts, the superstructure over the garbhagriha is called a shikhara. However, in South Indian Hindu architecture texts, the term shikhara means a dome-shaped crowning cap above the vimana.
A typical Hindu temple in Dravidian style have gopuram in the four directions i.e. East - main entrance, North and south - side entrances, West - only opened on auspicious day where it is believed we will go directly to Heaven.The temple's walls are typically square with the outer most wall having four gopura, one each on every side, situated exactly in the center of each wall. This will continue to next tier depending upon the size of the temple. The sanctum sanctorum and its towering roof (the central deity's shrine) are also called the vimana. Generally, these do not assume as much significance as the outer gopuram, with the exception of a few temples where the sanctum sanctorum'''s roofs are as famous as the temple complex itself.
The Brihadisvara Temple, Thanjavur and the Brihadisvara Temple, Gangaikonda Cholapuram, both 11th-century constructions of the Imperial Cholas, have massive and high vimanas, which is untypical in the south. These perhaps were intended to compete with the height of northern sikhara.