I would like to suggest you visit these places - Santorini, Great Barrier Reef, The Grand Canyon, The Great Wall of China and Bora Bora. All these places are unique and deserve proper attention. I managed to visit more than 20 countries working as a travel agent. It's amazing, isn't it? Here is a good article, check it
https://travelsites.com/blog/how-to-become-a-travel-agent/