A musical lamppost, giant sound mirrors and a large telescope are among the works of interactive art installed in Liverpool city centre as part of a new art trail.
Liverpool Discovers draws on 10 themes to mark significant figures, inventions and discoveries from the city's past.
It was created by Wild in Art, which previously created the Go Superlambanana and Go Penguin trails.
St Helens and Wirral also have their own art installations.
The trail is funded by the European Regional Development Fund through Culture Liverpool.
In Liverpool One, at Thomas Steers Way, artist Andy McKeown has built what are thought to be the UK's first musical lampposts, covering an area of about 100 metres long and 20 metres wide.
The lampposts play a selection of music including the 57 Number One chart toppers by Liverpool musicians and classic folk and jazz music.
"It started out as the biggest hits but there's so much more music," the artist said.
"It randomly picks from whichever tracks are on it, but if you press the button it changes the track.
"It is very quiet, if you're beyond about 30 to 40 centimetres of the lamppost you won't hear it, so you have to listen."
Among the other art works on the Liverpool Discovers trail, Suffragette Mary Bamber, described by Sylvia Pankhurst as 'the finest fighting platform speaker in the country', is commemorated in a mosaic on the 'Speakers Corner' of St George's Plateau.
Toxteth's Jeremiah Horrocks, a 17th Century astronomer who discovered the transit of Venus, is remembered by a giant telescope at Liverpool's Pier Head.
Next to Liverpool Cathedral on St James Mount, two giant sound mirrors reflect the sound of the city to listeners who can place their head inside the installation to hear the soundscape of the surrounding city.
In St Helens, the town's little known Hollywood successes such as Chariots of Fire writer Colin Welland are shown in an art installation that projects fleeting images.
Wirral's Viking heritage is recognised by a giant puppet called Kelda which will tour venues across the area until mid April.
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