Brunkebergstunneln is a hidden tunnel in Stockholm that far from all locals know about. With it’s cool design and it’s secretive existence it is definitely worth a visit while in Stockholm. This hidden gem is the smoothest way to get from the Stureplan-area to Hötorget or vice versa. The tunnel is long and narrow with lots of bicyclists but the beautiful interior will dim any claustrophobic tendencies. Try it!