If one is interested in the mysterious underground world of urban tunnels, then London is one of the best places to sleuth. London is full of abandoned military, civilian, postal, tube, and other tunnels - some are open for tours, some are open secrets, and some are speculation. But there's more to England's tunnels than those in London.

England boasts some of the oldest tunnels in the world dating back some 2,400 years (predating London). Ancient tunnels are fascinating and were often great feats of engineering. For thousands of years, the longest tunnels were those built by Emperor Claudius in the Roman Empire in Italy to drain a lake.

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The Ancient Tunnels of Cornwall

Cornwall lies at the southwestern extreme of England (and is known as one of England's favorite holiday destinations). In these charming lands of dramatic coastlines and rolling hills are over a dozen ancient tunnels. A casual visitor is unlikely to know there are some of England's most mysterious prehistoric surprises in this unassuming part of the country. These tunnels remain something of a mystery - no one seems to know why they were built.

Some tunnels are far off the tourist track and one will need to know where to find them. The region is a picturesque one and one that has been sculptured by mounds, bumps, and stones left behind by 150 generations working the land. There are Bronze Age barrows and much more, but few save for archeologists are aware of them.

  • Number of Ancient Tunnels: 14 Tunnels In Cornwall
  • Name: Called "Fogous"
  • Found: In Scotland, Ireland, Brittany, and Normandy

There are a total of fourteen known ancient tunnels in the region. They are known as "fogous" (from a Cornish word for cave). While there are similar "fogous" in Scotland, Ireland, Brittany, and Normandy, these are the only such tunnels known in England.

Related: It's Rumored That London Is Home To The Largest Secret Tunnel System In The World, So Here's What We Know

The Mysteriousness of the Fogous of The United Kingdom

There are even older tunnels in the UK - like the labyrinthine copper mines that were tunneled around 3,800 years ago in what is today Wales. But what makes the "fogous" different is that they weren't just dug out, they were also built.

It is thought that the ancients dug deep trenches and then built stone walls around them before topping them and capping filling in the area above them to create a tunnel.

  • Built: The Tunnels Were Built And Not Just Dug Out
  • Age Built: In The Iron Age

Halliggye Fogou is the best-preserved fogou, but it is also odd. It has an 8.4-meter passage at a height of 1.8 meters, but it narrows into another 4-meter long tunnel that's just 0.75 meters tall. Another tunnel branches off to the left and extends 27 meters (3x longer than the main chamber).

Related: The 1880 Chunnel That Was Never Completed (& What Was Built)

Suggestions have included whether they were hiding spots, burial grounds, used for storage, places to commune with the gods, or ceremonial. But none of these explanations seem satisfactory and archeologists are still at a loss to explain the intensely odd design of the fogous. Archeological digs have failed to validate any of these hypotheses. Of course, none of these are mutually exclusive, and they may have had multiple uses.

  • Purpose: The Purpose of The Fogous Remain A Mystery

All the fogous have been found within pre-historic settlements.

More Being Discovered and Visiting A Fogou

More may be hiding away as yet undiscovered. Another called Boden Fogou was found by a farmer when he was laying a pipe in his field in 1991 according to the BBC. Another was found by a tractor digging five years later.

If one is visiting the other countries of the United Kingdom, check out the fogous or souterrains there. In Scotland, they are also oddly shaped but are in more of a banana shape (they are also found on the Isle of Skye). They curve around a roundhouse or in a cruciform.

If one would like to visit a fogou in Cornwall, the best-preserved one is Halliggye Fogou. It is managed by English Heritage and is open to the public.

  • Halliggye Fogou: The best-preserved Fogou in Cornwall

The fogou is open during any reasonable daylight hours and is a little off the beaten track and one will need to hike to get there. Full directions are given on the English Heritage website. TripAdvisor also has information about visiting the Fogou in Carn Euny in Wales.