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There has been no for new buildings in Central London for many years now. In fact this was a problem by city planners as long ago as the 19th century. They decided that the only way to build was down. So they dug. Railways, roads, footpaths, sewers – they even buried rivers underneath the streets of London. building work in the heart of London has even more of London’s underground past, finding a world from as far back as Roman times.

One recent , at a building called “Number 1, Poultry” unearthed the “Via Decumania” – the old High Street of Roman London, which exactly the line of today’s main roads through the City of London.

There are even under the River Thames which has around 30 tunnels beneath it. The first of was built by Marc Brunel back in the 19th century. He began work in 1825 – it was a very job, and took him and his men 15 years. But the tunnel finally opened in 1840 and was a great . Some years later it was closed to people and used for a railway line.

One of the biggest underground in London is, of course, the underground railway – known as the “Tube”. Some Tube are more than a hundred years old, and have recently closed. For example, the tiny line to Aldwych, the heart of London’s theatre district, was closed in the 1990s. The station is now hired out to films and parties. Aldwych is just one of 40 ghost stations. Another is a station called “British Museum”, which some people say was closed because an Egyptian mummy had escaped from the museum and was haunting the station.