Waste material from building Wembley Stadium has been turned into four giant mounds in an urban park.
Around a million tons of rubble, clay and soil dug up during the demolition of the old Wembley and the building of the new stadium would usually have been dumped on a landfill site.
But much of the waste from both Wembley, and other major construction projects in London, was instead recycled.
Builders carried 60,000 lorry loads of material to a site near the A40 just outside London.
The busy main road carries thousands of cars a day to Oxford and Birmingham but the noise was a blight on nearby towns.
The four mounds, which are up to 22 metres tall, block much of the noise from the road, and are also part of a recreation park built on old wasteland.
And because Ealing Council charged up to £90 per truck to dump the waste the project cost taxpayers absolutely nothing.
Named Northala fields, it contains the small hills - which look like small tors - fishing lakes and a small area of woodland.
As builders had to carry the waste material a short distance rather than carting it to landfill sites, the project is also eco-friendly.
Architect Peter Fink, from Form Associates, which designed the project said he wanted to build a "multi-layered recreation area" and "urban fishery".