otherworldly
adj.looking or feeling like it belongs to a different world. You use this to describe something that is very strange, beautiful, or not like anything you have seen before.
adj.resembling or belonging to another world; having a quality that is strange, unearthly, or supernatural. Often used to describe landscapes or experiences that feel alien to the observer.
“The ancient ruins looked otherworldly in the moonlight.”
“The artist's use of deep blues and silvers created an otherworldly atmosphere that seemed to transport the viewer to a realm beyond the physical world.”
“That's what it's like standing in Egypt's coastal sabkhas—those otherworldly landscapes where the ground crunches beneath your feet and the air shimmers with heat.”
“The show ends with a forlorn and otherworldly solo, performed inside two clingfilm-wrapped frames forming a tunnel.”
From other world (“a world beyond death; a world other than the everyday world”) + -ly (suffix meaning having the likeness of, resembling forming adjectives).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.