It is correct ?

[Anna03]

in the sentece:

the capital city,_________ cathedral es one of the finest in the country,is worth visiting.

Can I write whose?
Is it correct?

[Jenny 7]

The sentence can read:
The capital city, whose cathedral is one of the finest in the country, is worth visiting.

[Anna03]

The sentence can read:
The capital city, whose cathedral is one of the finest in the country, is worth visiting.

Thank you