http://sli.mg/wtAu7n
Note that Chappell Road in the pic is currently 36th Street
You can find the map I screenshotted here:
https://www.loc.gov/resource/g3851bm.gct00131c/?sp=24
You can find & track all these small branches coming from Broad Branch. These have been turned into drainage/sewage when the land got developed. High probabability you can walk from CPP to Tenleytown Metro station during the day without seeing daylight once.
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Annon365 ago
Did anyone further investigate the blurred out drainage cover at the back of comet on google maps? If I lived by there I would go and check it out. If there is really tunnels you would only need to get in at one point and confirm it yourself