What architectural element is characteristic of the Taj Mahal?

The characteristic architectural element of the Taj Mahal is minarets. These tall, slender towers are a significant feature of Mughal architecture and serve both aesthetic and functional purposes. At the Taj Mahal, the minarets are positioned at the corners of the plinth and are designed to frame the central dome, adding to the overall symmetry and grandeur of the structure.

Minarets often symbolize the Islamic faith and are typically used for the call to prayer. In the context of the Taj Mahal, they enhance the building's verticality and serve to highlight the stunning white marble dome that stands at the center, creating a harmonious balance in the overall design. The use of minarets contributes to the monument's iconic silhouette, making it one of the most recognizable structures in the world.

The other architectural elements mentioned—flying buttresses, spiral staircases, and rooftop gardens—are not characteristic of the Taj Mahal. Flying buttresses are more commonly associated with Gothic architecture, while spiral staircases are functional but not a prominent feature of the Taj Mahal. Rooftop gardens, though they can enhance the aesthetics of a building, are not a defining characteristic of the Taj Mahal's design.