The public will be able to catch a glimpse of secret treasures in old buildings as part of an arts project called The Peeps.
The show will allow a glimpse into hidden areas
Spy holes have been put in walls of 20 places in Ancoats in Manchester. These include, a tunnel, a bell tower and a mill closed since the war.
The public can look through these holes and see objects that have been specially placed and lit for the show.
The artist wants passers-by to discover them as they go about their business.
There are no maps, guides, trails to follow or interpretation panels for The Peeps.
The exhibition is the work of internationally-renowned artist Dan Dubowitz and is being put on as part of the regeneration of the area.
The project was commissioned by New East Manchester and funded by North West Regional Development Agency (NWDA) and European Regional Development Fund (ERDF).
The inspiration for the work is a modern twist on the tradition of walling up secret trinkets into buildings.
During the restoration of Murray Mills, the oldest mill in Manchester, a child's shoe and various other objects were found.
The artist thought he would do something along similar lines but he added peep holes so people could see them.
Dan Dubowitz, describing his work said: "This is a place in flux and this installation reflects that.
"Gradually the scaffolding is coming down around Ancoats and people are moving back in.
"It is not about the project being complete, this is a work that will always be transforming."
Lyn Fenton, Ancoats Development Director for New East Manchester said: "What Dan has created is quite remarkable, he has really got under the skin of the area.
"As people walk through the streets, the only clues to the peepholes are the brass casts in the wall.
She added: "This is a subtle artwork that is to be discovered and heard about through word of mouth. This installation is unique and I have no doubt it will get people thinking for a very long time to come."