Vedic Architecture and Vastu Shastra
Vastu Shastra was codified by Vedic God Vishwakarma, the Lord of engineering and constructions. Mohan-jo-daro one of the most ancient cities of the world had underground sewage system, unthinkable even today in major cities of the world. It had well laid out streets, public libraries, swimming pools, water treatment plants and buildings and unlike most ancient monuments does not glorify graves of monarchs (pyramids, Chinese graves etc). Some of the old structures in India like the Brahadeeshwara temple in Tanjavur, Madurai Temple and the ancient pillar in Delhi falsely called the Kutub Minar boast great engineering skills. The iron pillars built by emperor Ashok in the fourth century BC have not rusted. Ajanta, Ellora and Elephant cave temples are rare master pieces in engineering and paintings. The fort of Kumbalgarh, the Dilwara Jain temples in Ajmer, Gomateshwara rock carvings near Mysore, rock carvings at Mahabalipuram, Sun temple in Konark, Belur and Halebedu temples are among the less known wonders of the world.
Ancient India had several world renowned universities like Takshashila, Nalanda, Vaishali, Kanchipuram, Ujjain and Madurai that attracted scholars from world over..in hampi (karnataka state) there is a statue  made up of stone which can emit "saptaswara" of music(sa re ga ma pa da ni)....the golconda fort in hyderabad is an acoustical wonder...our engineering and architecture knowledge cant be held parallel to anybody in the world....

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-HARSHA