General:
* Wonder: This emphasizes the sense of amazement and awe.
* Marvel: Similar to wonder, but often used for something impressive or extraordinary.
* Extraordinary: This implies something exceptional or remarkable.
* Phenomenon: This refers to something unusual or noteworthy, often in a scientific or natural context.
Specific to a person:
* Genius: For exceptional intellectual ability or talent.
* Prodigy: For someone with exceptional abilities, especially at a young age.
* Mastermind: For someone with exceptional intelligence and cunning.
Specific to a thing:
* Masterpiece: For a work of art or creation that is exceptional in its quality.
* Miracle: For something that is seemingly impossible or unbelievable.
* Triumph: For a great achievement or victory.
More abstract:
* Awe: The feeling of wonder and amazement.
* Astonishment: The feeling of great surprise or wonder.
* Wonderment: The state of being filled with wonder or amazement.
The best choice will depend on the specific context and the meaning you want to convey.