Map: https://connect.garmin.com/modern/activity/5023804251

We've been going through bike/walks around the urban landscape next to our house. We found a hole in a fence at the end of our street, so we went to check it out, that took us to 280 and stevens creek. There was a big tunnel for the creek, but a second huge tunnel, for I don't know what, it's big enough for a road (advance planning, nice).

Many years back, when I jumped a fence to get there, I couldn't go down, but someone nicely installed a rope ladder recently, so we went down and into the tunnel. That took us to the railroad (mostly unused) on the other side and connected to a street, or to sommerset park after removing a few metal wires that tried to patch a hole in the fence (thank you swiss army knife).

The secret BMX park is inaccessible unless you get to it through the railroad tracks from another access point. No idea who built it, it doesn't look official but yet it was well built: https://www.google.com/maps/@37.3322805,-122.0624639,157m/data=!3m1!1e3

We found that the freeway had doors in the wall, some you could just open and someone put chairs on the other side, maybe to just relax and watch traffic go by? :)

On the way back, I noticed that you could drive from a hole between the freeway walls through a railroad crossing that had been built for car crossing, to nowhere, the road stops there, although it almost connects to the stevens creek tunnel.

There is probably some interesting history and roads that maybe used to connect and don't connect anymore, or were meant to connect, but never did in the end. Either way, it was fun, we felt like urban explorers :)