This page of Anno 1800 game guide describes Zoo and Museum - new cultural building. You will find some interesting pieces of information below.
Zoo and Museum will become available once you bring artisans to your island. You can unlock them relatively fast - one should build docks to bring tourists to your island as quickly as possible. When it comes to the size of your city, it's totally up to you. You could continue to expand your facilities indefinitely but you need to remember about additional management costs. Zoo and Museum directly affect your culture factor, which determines city attractiveness.
How to obtain new animals for your Zoo and artifacts for your Museum?
When it comes to artifacts for your Museum and animals for your Zoo, you will collect most of them during expeditions. Move away from the world map, and at some point you will gain access to an expedition. You can select ships, supplies and certain crew members - your decision will affect the crew morale.
Reach your destination and you will have a short briefing, which allows several choices. Effects can differ - it all depends on the success of your mission. Bring the ship back to your city and you will complete the expedition. You will be given three rewards of different value. You will often receive new species of animals or valuable artifacts for your Museum.
An additional way to obtain valuable "goods" is to trade. Many factions have unique items which can be purchased. Thus, try to discover foreign nations and check the goods they offer frequently.