Monument is a type of Landmark. Landmark can be used for Orientation. Vertical is a type of Orientation. 
Violent is related to Accident. Accident is related to Mistake. Confuse is a type of Mistake. 
Monument --IsA--> Landmark --UsedFor--> Orientation <--IsA-- Vertical 
Violent <--RelatedTo--> Accident <--RelatedTo--> Mistake <--IsA-- Confuse 