In English, we often use past participles to create adjectives describing a completed state: a broken window, a rusted lock, or an abandoned building. Turkish does exactly the same thing using the -mIş suffix.
The Past Participle Suffix (-mIş)
To turn a verb into an adjective describing the result of a completed action, attach -mış, -miş, -muş, or -müş (following 4-way vowel harmony) to the verb stem.
Once formed, it acts like any other adjective and sits directly before the noun it modifies.
Describing Wear and Tear
When exploring ruins (harabe), you'll encounter things that have aged or decayed. Verbs like paslanmak (to rust), solmak (to fade), and tozlanmak (to get dusty) are frequently used with -mIş to describe these states.
Stacking with Noun Endings
Because it functions as a standard adjective, the -mIş word remains unchanged even when the noun it modifies takes plural or case suffixes. All the grammatical heavy lifting stays on the noun.
Just remember: verb stem + -mIş gives you the state of the object, ready to pair with any noun.