Conversation so far:
where is croatia located in the world map?
what is the captial of Croatia?
The capital city of Croatia is Zagreb.
what is the economy of Croatia?
Croatia's economy is dominated by service, industrial sectors and agriculture. Tourism is a significant source of revenue, ranked among the top 20 most popular tourist destinations in the world.
what is the top travel destination in Croatia?
Dubrovnik

Question: what is the city known for?
Self-contained rewrite: what is the city Dubrovnik known for?