The world is so tiny yet so large; one cannot possible experience every single thing it has to offer. So many beautiful sights to see, cultures, languages, weathers, people, stories, historical benchmarks, etc.
Having said that, the least one can do is visit the greatest monuments or buildings in the world. If you have an interest in connecting with the historical sentiments of the world, here is a list of some of the greatest buildings of all time that are spread across different countries (and their descriptions), that you can visit:
Infographic Source: The Greatest Buildings Of World History by Pennywell