Sweden Näckrosen (Underground Station)

This station is called "Näckrosen" and is located on the blue line of Stockholm's metro system. It was planned by architect Michael Granit and designed by the artist Lizzie Olsson Arle. The station opened in 1975.
Stockholm’s metro is the world’s longest art exhibition because nearly all of its 100 stations are designed by artists. So buying a ticket for public transport is like buying a ticket for a museum.

You need a valid ticket to get to any platform in the metro system. So why not use it to get around as well?