noun
bastion
BAS-chun/ˈbæstʃən/
An institution or group that strongly protects a belief or way of life.
The craft school remains a bastion of traditional woodworking.

Etymology
A fortress or rampart projection became a figurative stronghold defending a belief or way of life.
More examples
- The club became a bastion of local culture.
- The journal was a bastion of independent criticism.
Forms
bastion
Similar words
- stronghold
- Emphasizes a place where support is concentrated.
- bulwark
- Emphasizes protection against a threat.