Examples:

• Where did it happen? In the studio of Valerie house.
• Where did it happen?
• Where did it happen?
• Where did it happen?
• Where did it happen?
• There was a car accident on the freeway. - Where did it happen?
• Yesterday there was a train crash. - Where did it happen?
• You say you were mugged in this park. Where did it happen exactly, ma'am?
• I'm investigating the accident. Where did it happen? - It happened near here.
• I tripped on a loose stone on the walkway and fell. - Where did it happen?