What are the greatest cultural experiences you have ever had during a trip?

These cultural experiences are ones that are etched in my memory:

Seeing the murals on the tombs of Valley of the Kings in Luxor, Egypt. I also bought the extra ticket to Seti I's tomb, worth every dollar.
The entire country of Japan. Seriously, I am actually surprised that Japan hasn't been the most visited country in the world yes. The tourism potential Japan has is colossal: so much history, culture, beauty.
Angkor Wat exceeded my expectations.