Stockholm's underground structures remind the Swiss cheese. Here is a list of the interesting ones. Some, unfortunately, are impossible to visit, but important to know they exist.
Humlegårdsgatan 26, 114 46 Stockholm, Sweden
Renstiernas gata 37, 116 31 Stockholm, Sweden
Drottning Kristinas väg 51, 114 28 Stockholm, Sweden
Sickla industriväg 19, 131 54 Nacka, Sweden
Vidjavägen 17, 123 52 Farsta, Sweden
