The Anno1800 Season 3 Pass includes the following three DLCs:

DOCKLANDS – Turn your city into a global trade hub with a modular warehouse system and use trade contracts to create a monopoly on your favorite goods.
TOURIST SEASON – Attract the new Tourist resident tier to your city’s hotels and keep them entertained with restaurants and bus tours of hotspots such as the new Tower monument.
THE HIGH LIFE – Change your empire’s skyline forever with the construction of the first skyscrapers. Keep your high-flying investors happy with shopping malls and the construction of the game’s biggest monument, the Empire Building.
BONUS CONTENT – In addition, you will receive three exclusive ornaments themed after the new content, available today.