Ruin
… derelict over time due to long-term weathering and scavenging.
Synonyms of ruin
verb: destroy, wreck, spoil, demolish, ravage, devastate; noun: wreck, destruction, ruination, perdition, downfall, undoing, doom, collapse, devastation; plural: wrecks, destructions, ruinations, perditions, downfalls, undoings, dooms, collapses, devastations; related terms: desolation.