weltberühmt
world-famous
Known and famous all over the world, or at least in a great many countries.
Der Eiffelturm in Paris ist ein weltberühmtes Bauwerk.
The Eiffel Tower in Paris is a world-famous structure.

world-famous
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world-famous
Known and famous all over the world, or at least in a great many countries.
Der Eiffelturm in Paris ist ein weltberühmtes Bauwerk.
The Eiffel Tower in Paris is a world-famous structure.

The adjective 'weltberühmt' (world-famous) is made up of 'die Welt' (the world) and 'berühmt' (famous). So it literally means that someone or something is famous throughout the whole world.
Die Beatles sind eine weltberühmte Band aus Liverpool.
The Beatles are a world-famous band from Liverpool.
If you want to state the reason for the fame, use the preposition 'für' followed by the accusative. The structure is: 'jemand/etwas ist weltberühmt für etwas' (someone/something is world-famous for something).
Die Schweiz ist weltberühmt für ihre Schokolade und ihre Uhren.
Switzerland is world-famous for its chocolate and its watches.
The adjective is often used to describe people, places, structures, works of art, or brands. Typical examples are: 'ein weltberühmter Schauspieler' (a world-famous actor), 'eine weltberühmte Sehenswürdigkeit' (a world-famous landmark), or 'eine weltberühmte Marke' (a world-famous brand).
Leonardo da Vincis Mona Lisa ist ein weltberühmtes Gemälde.
Leonardo da Vinci's Mona Lisa is a world-famous painting.
known
'bekannt' and 'weltberühmt' both describe that many people know someone or something. But 'bekannt' is much broader: something can be known only in a city, in a country, or within a particular group. 'weltberühmt' is much stronger and means that something is known and famous in a great many countries. The words can be confused because both have to do with fame. As a rule of thumb: everything that is 'weltberühmt' is 'bekannt', but not everything that is 'bekannt' is 'weltberühmt'.

Im Urlaub besichtigten wir ein weltberühmtes Museum.
On vacation, we visited a world-famous museum.
Das kleine Restaurant ist bei den Leuten im Viertel sehr bekannt.
The small restaurant is very well known among people in the neighborhood.