Sidi Bashir Mosque

The Sidi Bashir Mosque is a former Sufi mosque, now in partial ruins in Ahmedabad, Gujarat, India. Only the central gateway and two minarets survive; they are known as the Jhulta Minar or Shaking Minarets. The structure is a Monument of National Importance. The Jhulta Minar, a part of the Siddi Bashir Mosque, is a notable example of Indo-Islamic architecture built in 1461 CE. The three-storey tall structure, with intricate designs on each of the minarets, is known for swaying when minimal force is applied to its uppermost arc. A gentle shaking of either minaret results in the vibration of the other minaret after a few seconds, though the connecting passage remains free of any vibration. This unconventional structure is a mystery, unsolved by engineers. According to popular belief, the Jhulta Minar was built to receive early signals of earthquakes.

Mosque data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).