I’m very much amused that this actually has its own Unilocal page. Historically, I learned that the purpose of this tunnel was so workers on the Zizkov side could commute to Karlin for work. Interesting. I personally find the tunnel to be on the creepy side, but unfortunately, it’s the most efficient way for me to get to Vitkov Park, so I’m forced to walk through it every day. It’s actually a pretty lengthy uphill walk… there’re some dim/grim lights above head, so if you ever find yourself walking at night, you can at least see where you’re going. Sometimes you get some very interesting people who are worshipping at this little altar on the side, but if you go during the day time, it’s just people who are making the commute between the two places so it’s not too bad.