When something is so astonishing or magnificent that you can hardly speak, it's awe-inspiring. You dream might be to travel to Arizona to see the awe-inspiring sight of the Grand Canyon.
What's awe-inspiring is in the eye of the beholder — in other words, your first visit to New York may provide one awe-inspiring sight after another, from the towering skyscrapers to the Statue of Liberty. Someone born and raised there might be unimpressed, finding the rugged coast of Maine to be far more awe-inspiring. If something inspires a feeling of awe in you (a sense of overwhelming wonder), it's awe-inspiring.