Heritage temples and sites built after the Buddha’s lifetime
India
Ajanta Caves
The Ajanta Caves are approximately 30 rock-cut Buddhist cave monuments which date from the 2nd century BCE to about 480 CE in Aurangabad district of Maharashtra state of India.
Ellora Caves
Ellora is a UNESCO World Heritage Site located in the Aurangabad district of Maharashtra, India. It is one of the largest rock-cut monastery-temple cave complexes in the world, featuring Hindu, Buddhist and Jain monuments, and artwork, dating from the 600–1000 CE period.
There are over 100 caves at the site, all excavated from the basalt cliffs in the Charanandri Hills, 34 of which are open to public. These consist of 12 Buddhist (caves 1–12), 17 Hindu (caves 13–29) and 5 Jain (caves 30–34) caves, each group representing deities and mythologies prevalent in the 1st millennium CE, as well as monasteries of each respective religion.
https://en.wikipedia.org/wiki/Ellora_Caves
Sanchi
Sanchi Stupa is a Buddhist complex, famous for its Great Stupa, on a hilltop at Sanchi Town in Raisen District of the State of Madhya Pradesh, India. It is located in 46 km north-east of Bhopal, capital of Madhya Pradesh. The Great Stupa at Sanchi is one of the oldest stone structures in India, and an important monument of Indian Architecture. It was originally commissioned by the emperor Ashoka in the 3rd century BCE.