The invasion of tourists seems to take away some of the place's privacy and it can even destroy its usually peaceful environment.

invasion 是名词，来自动词 invade（入侵、涌入）。词根 vad- 表示"走"（如 wade 涉水），前缀 in- 表示"进入"。原指军事入侵，现常比喻大量人或事物的涌入。在句中指"游客大量涌入"的现象。