Question

First in different fields ​

Answer 1

Architecture

First dam in India: Kallanai Dam, one of the world's oldest, still in use; build across the Kaveri river in Thiruchirapalli District in the state of Tamil Nadu in South India.[1] originally constructed by the Chola king Karikala Cholan around the 2nd century BC

First Stepwell still existing: Mata Bhavani's Stepwell, built in the 11th century in Gujarat

First temple constructed from a single rock, still standing: Kailasa temple, Ellora, built in 744 CE by Rashtrakuta king Krishna I

First temple in Kalinga architecture still standing: Konark Sun Temple, Puri, Odisha, built in 1255 AD

First Indian temple with many interconnected structures still standing: Brihadeeswarar Temple, Tanjore, Tamil Nadu, built in 1002 AD

First true dome in India: Alai Darwaza, Qutb complex, Delhi, built in 1311 CE, by first Khalji Sultan of Delhi, Ala-ud-din Khalji

First true arch in India: Balban's tomb, Mehrauli Archeological Park, Delhi, built c. 1287 CE, by Ghiyas ud din Balban of Mamluk dynasty

First garden-tomb on the Indian subcontinent, also the first with Persian double-dome: Humayun's Tomb, Delhi, built 1562–1571 CE

First church in India: St. Thomas Church, Palayoor Built in 52 AD under leadership of St. Thomas the Apostle its a Mix of Persian and Kerala architecture

First mosque in India: Cheraman Juma Mosque in Methala, Kodungallur Taluk, Thrissur District of Kerala, Built in 629 AD.