Tee on suosittu juoma ympäri maailman.

[English Translation"]Tea is a popular beverage throughout the world.[/details]

ympäri maailmaa [?]
maailman ympäri [?]

Interesting.
Wiktionary agrees with you, but if you search for “ympäri maailman” you get over 2 million hits.

I asked the natives, and they said:

Wiktionary doesn’t tell the whole truth. With the meaning “everywhere in X”, ympäri is a preposition with genitive: ympäri maailman, ympäri kaupungin, ympäri Suomen, etc.

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Interesting indeed: none of my grammar books mention this usage. One of them mentions kautta maan (all over the country), though.

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