The colossal buddhas in bamiyan, afghanistan (now destroyed), provide evidence of

cultural diffusion

Explanation:

The Colossal Buddhas in Bamiyan, Afghanistan is a nice example of cultural diffusion. The Buddhism appeared in India. It started to spread around the Indian subcontinent and soon became very popular. From its place of origin, the Buddhism started to spread around in the neighboring regions, also managing to reach Afghanistan. Afghanistan was mostly Zoroastrian at that period, but the Buddhism seemed very appealing to lot of people, so they adopted this foreign teaching. As they adopted the Buddhism, they practically got involved into a cultural diffusion, as it is the process of adopting cultural traits from another place.

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