Strikingly modern homes will be among the properties across the Province being thrown open to the public for free this coming weekend.
There will be tours of everything from a wasp-coloured lighthouse to the Belfast Harbour Commissioner’s Office – with a handful of private householders also welcoming visitors across their thresholds.
All events are taking place on Saturday and Sunday, though some only happen on one day.
Called the European Heritage Open Days, this is the 16th year the programme has run, and it links in with similar events taking place across Europe.
The whole thing is being organised by the Northern Ireland Environment Agency, part of the Department of the Environment.
All in all, more than 400 venues will be involved in the massive weekend programme.
Among those opening up their own home will be Alan Jones, joint head of architecture at Queen’s University Belfast.
Mr Jones’ house on Portglenone Road, Randalstown, had last taken part in 2007.
Back then they had around 600 visitors.
“Imagine how many visitors you’d normally get – six a week coming over your threshold?” he said.
“So that’s equivalent of two years’ worth of guests coming through the house in a weekend. That’s quite a lot of traffic.”
No booking is required beforehand, but he said last time around they had visitors turning up perhaps an hour late.
“We’re going to be quite religious about the times,” he said. “Late-comers and early-comers won’t get in.”
He describes the building as very dark on the outside but very light indoors, and as looking “more like a mausoleum or a telephone exchange than a house”.
Other private homes opening up this weekend are the bright and angular Origami House at Kells, and the former Tattykeeran Church in Tempo.
The former belongs to architect Jane Burnside, who will be opening it to the public on Saturday.
She is booked up, she said, with about 40 visitors set to come along, adding: “I don’t think we could fit 600!”
It was one way to demonstrate to the public how ”contemporary architecture can be beautiful and add to our landscape, rather than detract from it”.
Across Ulster a string of “living history” events will be taking place too.
One will be at Newtownards Priory, when a mock monk by the name of Brother Graeme will ask visitors to try their hand at writing with a goose quill pen from 1pm to 5pm on Sunday.
Similarly, Ballycopeland Windmill, Millisle, will host a “Meet the Miller” event on Sunday from 1pm to 5pm.
. For full information on all events, see www.discovernorthernireland.com/ehod