[{"customer_id":151,"first_name":"Nakia","last_name":"Boyle","visited_places":[{"country":"Portugal","cities":["South Nicklausburgh","East Graham"]},{"country":"Rwanda","cities":["West Kristofer","Effertzbury","Stokeston","South Darionfort","Lewisport"]}]}]

db.collection.find({"visited_places":{"$elemMatch":{"country":"Portugal","cities":{"$elemMatch":{"$eq":"East Graham"}}}}},)