Which episode title featured a visit to the country of Cuba?
CREATE TABLE "series_4_1999" (
  "episode_no" text,
  "episode_title" text,
  "uk_broadcast_date" text,
  "presenter" text,
  "details_of_journey" text,
  "countries_visited" text
);
SELECT "episode_title" FROM "series_4_1999" WHERE "countries_visited"='cuba';