Cynosure

Something bright that attracts the eyes, (therefore) something that serves as a beacon, guide

Examples:

Yes, we have throned Him in our minds and hearts — the cynosure of our wandering thoughts — the monarch of our warmest affections, hopes, desires.
— Richard Fuller, Dictionary of Burning Words of Brilliant Writers (1895)

The age demanded a hero, Lawrence qualified, and the 20th century then got what it deserved: a loner, an ascetic, a man who might have been happier as a medieval monk than as the public cynosure he became
— Paul Gray, in The Hero Our Century Deserved, about T.E. Lawrence (1989)

Meadows trim, with daisies pied,
Shallow brooks, and rivers wide;
Towers and balements it sees
Bosomed high in tufted trees,
Where perhaps some beauty lies,
The cynosure of neighboring eyes.
— John Milton, L’Allegro (1631)

Etymology:

• Greek: Cyno means “dog”, oura is “tail”. referring to the tail of the Little Dipper, which contains Polaris, the star used to navigate in the northern hemisphere