Write SQL query to solve given problem: In which cities were the 1976 winter and summer games held?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.city_name FROM games_city AS T1 INNER JOIN city AS T2 ON T1.city_id = T2.id INNER JOIN games AS T3 ON T1.games_id = T3.id WHERE T3.games_name IN ('1976 Summer', '1976 Winter')