Grand Canyon [wiki]. Words are not enough so I'll try not to use too many more.
It was simply breathtaking.
Job 38:4 “Where were you when I laid the earth’s foundation? Tell me, if you understand.
5 Who marked off its dimensions? Surely you know! Who stretched a measuring line across it? 6 On what were its footings set, or who laid its cornerstone…
… 12 “Have you ever given orders to the morning, or shown the dawn its place, 13 that it might take the earth by the edges and shake the wicked out of it? 14 The earth takes shape like clay under a seal; its features stand out like those of a garment.