This is the 10209th most frequent Korean word.
괌
Guam.
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.
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 usage, '괌' signifies the target destination of the planned trip.