This is the 10209th most frequent Korean word.
괌
Guam.
Here, '괌' indicates the location where the action (taking pictures) occurred.
괌에서 찍은 사진들이 정말 멋져요.
The pictures taken in Guam are really wonderful.
In this sentence, '괌' is used as a proper noun referring to the island Guam, specifying its characteristics.
괌은 아름다운 해변이 있는 관광지입니다.
Guam is a tourist destination with beautiful beaches.
In this usage, '괌' signifies the target destination of the planned trip.