Geography: With stations including Kungsträdgården and T-Centralen, what city's metro system is called "the world's longest art gallery"?

Stockholm's metro has been called "the world's longest art exhibition" for good reason. The 70-mile long metro system connecting the 14 islands of the city contains metro stations of paintings, mosaics, sculptures, and carvings that capture travelers' imaginations. All you need to visit this exhibition is a metro ticket.

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