Similar in meaning:
* Bewitching
* Captivating
* Charming
* Hypnotic
* Mesmerizing
* Spellbinding
* Alluring
* Enthralling
* Ravishing
* Seductive
More specific:
* Ethereal (suggests otherworldly beauty)
* Magical (suggests the presence of magic)
* Dreamlike (suggests a state of unreality)
* Romantic (suggests love and passion)
* Sublime (suggests a sense of awe and wonder)
The best adjective to use will depend on the specific context and the desired effect.