There’s more to Montréal than meets the eye. Discover the “underground city” (known locally as the RESO) and heart of downtown Montreal on this engaging, small-group walking tour led by a certified, licensed guide from MTL Detours – a trusted, top-rated, and 100% local company.

Spanning over 33 km (21 miles), the “Underground City” is the largest interior pedestrian network in the world. It connects downtown office towers, shopping centres, metro stations, public art, cafés, hotels, and historic buildings – all hidden in plain sight beneath the surface of the city.

You’ll explore some of the most fascinating and photogenic sections of the RESO, as well as key sites above ground in the heart of downtown Montréal. Along the way, your guide will share real stories about how this network came to be – from Expo 67, to urban design innovations, to how locals use it every day to live, work, and move through the city (and stay warm!).

This is not just a mall walk. It’s a guided experience rich in storytelling, local insight, and architectural discovery – a deeper look at how Montréal’s identity has been shaped both above and below ground.

What you’ll experience:

• A guided walk through the most interesting parts of the RESO network and street-level outdoor sights in Downtown Montreal

• Intriguing public art, hidden architecture, and unique spaces

• Iconic landmarks like Place Ville-Marie, Christ Church Cathedral and World Trade Centre Montreal

• An intro on how the Metro integrates with the RESO, so you can confidently navigate the network on your own afterward

• A meaningful behind-the-scenes look at Montréal’s identity – above and below ground

• Insights into Montréal’s past, present, and future through a local lens

This tour is limited to only 10 guests, keeping it intimate, personal, and the guide-guest connection strong. It’s ideal for cold, rainy, or sweltering days – or any time you want to see Montréal from a different perspective, both from indoors and outdoors.

At the end of your 2-hour walk, you’ll receive a thoughtfully assembled list of recommendations for our favorite places to eat, drink, explore, and experience the city like a local.

Why choose this tour?

• Certified, licensed guides (with the mandatory City of Montréal guide permit – not just “locals”)

• A highly-rated locally owned independent tour company with thousands of five-star reviews across multiple platforms

• Small groups, smart storytelling, no fluff

Come curious – leave confident. This is the real Montréal – one level deeper – that most visitors never see.