Wandering around Norwich, with the familiar sight of the cathedral and castle dominating the skyline, it's often easy to be fooled into forgetting just how much does change in the city.
But as these images show, there are parts of the city which have undergone quite a transformation in a relatively short space of time.
On each of these images, you can see just how the march of progress has changed how the city looks by moving the slider from left to right.
We have picked areas of the city which have undergone the most dramatic alterations, where old landmarks have been replaced with new ones and where familiar buildings have made way for new homes.
The Forum
It was in 1994 that Norwich's library and archives went up in flames. But from the ashes rose The Forum, which is visited by more than 2.5m people each year.
Back in 1999, though, it had yet to be built and this image shows how the site looked just before building work started.
Also of note is Norwich market, before the revamp of 2005 and that the car park behind City Hall was still in use. The car park was shut in 2003 amid safety fears.
Carrow Road/Riverside
The redevelopment of Riverside was one of the biggest - and most controversial - transformations in Norwich in recent years. Once an industrial area, the closure of the likes of engineering company Boulton and Paul had left the area derelict and ripe for development.
The 1999 image shows work on the site under way. The building which houses Morrisons has been constructed, but the car park is still under construction.
And at Norwich City's Carrow Road ground, the South Stand had yet to be developed, while a car park remained where homes now stand in Geoffrey Watling Way.
Rosary Road/The Nest
Speaking of the Canaries, this image shows development at their former home of The Nest, off Rosary Road.
In 1999, Bertram Books was still at the site, but has since made way for homes.
However, still standing at the site is the gas holder on Gas Hill - now the last such structure in the city.
Barrack Street
Still a work in progress to this day, the £50m St James development was supposed to include 200 homes, a 60-bed hotel, a 637 space car park and offices.
So far, only some of the offices have been built.
And this image shows what vanished. In 1999, the Jarrold printworks stood on the site, while nearby flats, now demolished, stood on Barrack Street.
Chapelfield
The Chapelfield shopping centre opened in 2005. But people of a certain vintage will still have fond memories of the smell of chocolate which wafted from the building which preceded it. Originally built by Albert Caley and his son Edward to produce mineral water, the factory started manufacturing drinking cocoa in 1883 and then chocolate in 1886.
The chocolate factory was sold to Mackintosh in 1932 and the first packet of Rolo was manufactured five years later. The factory had to be rebuilt after it was destroyed during the Second World War and, in 1969, Mackintosh merged with Rowntree, with the factory employing about 1,000 people.
Rowntree Mackintosh was taken over by Nestle in 1988, but closed in 1996. This picture shows the factory, which was demolished in 2004 - still standing. Another building since razed to the ground, but still visible in 1999. is the nearby Malthouse multi-storey car park, which was knocked down in 2003 as part of the Chapelfield redevelopment.
Market/War Memorial
Here's a closer look at Norwich Market and how it was changed following the 2005 revamp. Out went the colourful fabric awnings, replaced by solid structures, retaining the colourful stripes of old. You can also see how the stalls at the back of the market, which were there in 1999, disappeared.
Also visible in the more recent image is the realigned war memorial, now facing City Hall. In 1999, the memorial still faced the memorial gardens.
The long-running campaign to re-orientate the Sir Edwin Lutyens cenotaph eventually succeeded, when it was rededicated in 2011.
Queen's Hills
Moving away from Norwich itself, one of the largest housing developments in recent years was Queen's Hills, in Costessey.
When the 1999 picture was taken, what we now know as Queen's Hills was an aggregates site.
Now, it is a community, complete with its own school.
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