Strong and Positive:
* Amazing
* Astounding
* Brilliant
* Fabulous
* Fantastic
* Magnificent
* Marvelous
* Splendid
* Terrific
* Exceptional
* Extraordinary
* Remarkable
* Outstanding
More Gentle and Positive:
* Delightful
* Lovely
* Pleasant
* Charming
* Exquisite
* Fine
* Nice
* Superb
More Specific Meanings:
* Impressive (for something that inspires awe)
* Enthralling (for something that holds your attention)
* Captivating (for something that charms you)
* Heartwarming (for something that evokes emotional warmth)
* Inspiring (for something that motivates you)
* Joyful (for something that brings happiness)
The best synonym to use will depend on the specific context and what you want to emphasize.