The City of London has some remarkable hidden garden gems.

The garden on the roof of Cannon Street Station is one of the more notable while a particularly private garden is that of the Bank of England in Threadneedle Street.

But one of the most dramatic is that of St Dunstan's in the East.

This medieval church was devastated with bombs in World War II, leaving the interior just an empty shell.

But the ruins and the Wren Tower have become dramatic frames for the imaginative planting of wall shrubs and climbers.

This is an extraordinary example of a small space in the City, which makes the maximum use of scarce resources.

The City of London Architects and Parks Departments won a Landscape Heritage Award in 1976 for their imaginative work off Roehampton Lane.

This green oasis is busy on weekday lunchtimes with office workers eating their lunches, but becomes eerily quiet at weekends.