Porphy no Nagai Tabi

World Masterpiece Theatre is a Japanese TV anime staple that showcases an animated version of a different classical book or story each year. It originally aired from 1969 to 1997 and then resumed in 2007. WMT series were originally produced by Mushi Production and Zuiyo Eizo, and then by the latter's successor Nippon Animation, and originally air primarily on Fuji Television.

The series has been known by various different names over the years, often reflecting changes to the sponsors, but "World Masterpiece Theatre" is the name most commonly used by viewers. Nippon Animation's official English name for the series is The Classic Family Theater Series.

(Source: Wikipedia)

These classic Nippon Animation series were usually adaptations of well-known literature by non-Japanese authors. Many ran for exactly one year as part of the well-known family-friendly program "World Masterpiece Theater".

animes set in different parts of the planet

Collection of historical semi-realistic or realistic works that detail the historical events of Europe or daily life of people in European historical context.

anime where the protagonist travels to different parts of the world.

These animes are either underrated or it doesn't get enough attention it deserves.
I am also an easy watcher so most of my score will be high (7+), but these animes need to have higher rating anyway--

I have another list for Underrated Movie/ONA/Short Animated Film/Animated MV: https://myanimelist.net/stacks/33412

Anime which heavily involve natural disasters and how the characters react/cope with them

This list is taking suggestions

A list of anime that are adaptions of children's books (all around the globe). Recommended for reasons of nostalgia and as Iyashikei-anime before Iyashikei was a thing.