The Third Man is a famous sewer overflow found in Vienna that outfalls to the River Wien.
The River Wien flows through Vienna in a cutting which for around 2km becomes a large arched culvert
Bower's brook flows in a southernly direction through Widnes and eventually joins the Mersey. It's mostly culverted although it's path can be traced above ground by large wooden hatches.
The River Hyndburn drops into a culvert that takes it around 300m under a field
This culvert takes the Woodnook Water under Accrington town centre where it meets with the Warmden Brook.
Warden Grotto is around 700m long and takes the Warmden Brook under South East Accrington before it joins with Woodnook Water