Something astonishing is astounding, staggering, stupefying, amazing, or incredible. It's not something you see every day.

This is a pretty strong word. A dog shaking hands is not astonishing, but a dog calling 911 for its owner definitely is. Astonishing things are amazing; they blow your mind. When people first walked on the moon, that was astonishing. Miracles are astonishing. If you say, "Holy cow! I can't believe what I'm seeing," you're probably seeing something astonishing.

Definitions of astonishing
  1. adjective
    so surprisingly impressive as to stun or overwhelm
    “such an enormous response was astonishing
    synonyms: astounding, staggering, stupefying
    making a strong or vivid impression
  2. adjective
    surprising greatly
    “the dog was capable of astonishing tricks”
    synonyms: amazing
    causing surprise or wonder or amazement
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