One of 22 cities globally to do the annual Open House programme, the idea is to get you behind the doors and windows of buildings you’d otherwise never see beyond the facade.

From modern office blocks like Google (recommended; I’ve been in there on biz and it’s fab) to the brand new Marker Hotel in the Dockands to private houses, including Aras an Uachtarain, there’s are 100 spaces to discover in Dublin over the weekend of 4-6 October, when Open House takes place.

Crucially, it’s all free and house tours are guide-accompanied. From previous years you’ll need to check out the openhousedublin.com website beforehand for the scheduled days and times for the places you want to visit. It’s well worth trying to squeeze in a couple: this year I’m aiming for Dun Laoghaire’s Royal Victoria Baths. You?

Michael D lives here: it's Aras an Uachtarain and sure you never know, he might even be home. Pic: Richie McCann.

Scott Tallon Walker's RTE Radio Centre's another on the list. A building many in the country are connected to daily, but one that few have seen inside. Here's your chance. Pic: Paul Tierney.

A famous Dublin sight, this. The Kiosk sits just off Fitzwilliam Square in the Georgian part of the city. Pic: Lisa Cassidy.

The lobby of the Dublin's newest five-star hotel, the Marker is in the docklands, right by the Bord Gais Energy Theatre and is pretty spectacular. But how will it date? Pic: Adrian Wilson.

Smithfield's fruit and vegetable market is one of those auld Dubbeliin towen institutions; it's another you can be guided around over the Open House weekend.