What is the significance of the images on the reverse side of Indian Currencies?

1. Indian 10-rupee note

Motif of the Sun Temple and the Konark-Odisha

2. Indian 20-rupee note

Motif of Ellora Caves-Maharastra

3. Indian 50-rupee note

Motif of Hampi with Chariot-Karnataka

4. Indian 100-rupee note

Motif of "Rani ki Vav" (Queen's stepwell)-Gujarat

5. Indian 200-rupee note

Motif of Sanchi Stupa-Madhya Pradesh

6. Indian 500-rupee note

Ashoka Pillar Emblem-Delhi

7. Indian 2000-rupee note

Mangalyaan