It takes quite a walk to get here from the actual centre. A remarkable long walk actually. Brussel obviously was a big town already in the late Middle Ages. The Hallepoort ('Halle gate', named like that because it stood at the road to the town of Halle) dates from the 14th century and was part of a wall that was 8 km's long, had 7 gates, 72 big towers, 172 small towers and was surrounded by moats that at some places were 10 metres wide. Imagine that. In the 19th century its use as a prison saved the Hallepoort from demolition. A restoration by architect Henri Beyaert gave the building its current look in romantic neo-Gothic style.
the hallepoort is one of the remnants of the former city walls.
The walls have been torn down, but there layout is still recognisable, as it has been turned into a heart- shaped boulevard circling the city center.