• Attractions
  • Monument
  • Architectural heritage

This 30-metre-high tower was used by our ancestors with a network of 85 culminating points (including the Lion's Mound in Waterloo, the belfry in Mons...) to define in the 19th century, a map of Belgium using the triangulation system. It was later used to refine calculations for longitudes, latitudes, altitudes and gravity.

The geodetic monument, nicknamed the Bonhomme de fer or Tin man, can be found South of the Houssière forest.

The Bonhomme de fer principle

It was possible, from this tower, to see all a chosen selection of culminating points, the lion statue in Waterloo for example. Using trigonometry and ratios, an incredibly precise map, reaching accuracy of about one centimetre was created.

Guided tours

Guided tours are organised for local events (Heritage Days, nature walks, special hikes...). Brochures and trail maps are available from the Tourist Office in Braine-Le-Comte.

COVID-19 : Recreational/tourist travel to and from Belgium is prohibited until 18 April 2021. In accordance with the latest Covid-19 restrictions, most museums, tourist attractions and information centres are now closed in Wallonia, and events cancelled. We do our best to keep our information up to date but it's always best to check with the site you wish to visit before heading there - by phone, email, social media or simply a look at their website - to see their latest opening hours and entry conditions. Some will prefer you to book your ticket in advance. Infos
This information is given for indication purposes only, best to check with the site you hope to visit before heading there - by phone, email, social media or simply by visiting their website.
Discount vouchers

Discount vouchers

Download
Brochures

Brochures

Download