Which culture or religion has the most interesting traditions?

[Sazra]

Ancient China
Ancient Egypt
Ancient Greece
Ancient Rome
Medieval Europe
India
Japan
Russia
Aborigines
Native Americans
Aztecs
Celts
Druids
Incas
Vikings
Buddhism
Christianity
Hinduism
Islam
Judaism
Shintoism
Sikhism

Please pick one or more. Please tell me about any of these traditions if you can.
I need to study a few for my college project and I can't decide which ones to do!
Thanks.