Game concept
Point of Interest
The game also links it as Points of Interest.
From the game's encyclopedia
A Point of Interest is a location in the world that is worth visiting. When you visit that location for the first time, you will gain the benefits associated with it.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Point of Interest is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Point of Interest is a location in the world that is worth visiting." It is part of Travel. The game also links it as Points of Interest. Patch 1.20.1.2, from game/common/game_concepts/04_ep2_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/04_ep2_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.