Prague's narrowest street is a fun and quirky little attraction. The street is called Vinárna Čertovka and is located in the charming district of Malá Strana (Lesser Town).
Width: At its narrowest point, the street is only about 50 centimeters wide. It's impossible for two people to pass each other.
Pedestrian Traffic Light: Because it's so narrow, there's a traffic light at each end of the approximately 10-meter-long passage. You must press a button to get a green light and ensure there's no oncoming "traffic" (other pedestrians) before entering.
Purpose: Technically, it's not an official street but rather the last preserved fire escape in the area. It leads from U Lužického semináře street down to a restaurant of the same name, which has a terrace by the Čertovka Canal (Devil's Stream). Although fully functional, the little alley is now best known as a fun tourist attraction and a popular spot for taking photos. It's a perfect example of the many curious and historical details you can find when exploring Prague's old streets.