Sacré-Cœur's front steps in Zone 1
Map of Sacré-Cœur and it's steps
Sacré-Cœur is one of the most recognizable buildings in The Saboteur. This is because of it's close proximity to La Belle du Nuit and it's placement atop a hill in the northern most place in the city. Sacré-Cœur towers over the rest of the city and can be seen from almost anywhere in Paris, and even out from the countryside, Le Havre, and Saarbrücken. The only building that challenges it's place is the Eiffel Tower itself.
Sacré-Cœur is one of the most visible buildings in Paris, along with the Pantheon, the Eiffel Tower, and despite it's small stature, Forum Des Halles. Because Sacré-Cœur is so close to La Belle du Nuit, Sean Devlin spends a lot of his time around Sacré-Cœur in the early parts of the game, being right down the road. It is known for it's large set of steps that lead up to it and it's huge rounded towers that shine. As the developers expected the player to spend time around it, they have placed an arms dealer here, despite Santos being so close by, multiple stunt jumps around the hill, and a viewpoint atop the building.
Being that it is in the first Sector and one of the closest viewpoints to La Belle, climbing atop Sacré-Cœur was designed to be incredibly straightforward while climbing buildings gets increasingly more complicated later on. Along the side of the building is a set of scaffolding and the rest of the way up is in a very linear fashion designed to be very visible as to where to go next. As the first scenic point, this makes a lot of sense. Since it's position is so high up, the rest of the city is also incredibly visible, allowing the player to get familiar with the rest of the city easily.
Sacré-Cœur is so large that it can be seen from virtually any place on the map, so long as the view isn't obscured. It's best feature because of this is it serves as a great positioning tool. Since it has it's large dome up front and second tower behind it, the player can always look and easily find their location since the tall tower is on the north side and the dome is on the south side. Since it can be seen as far out as La Havre and Saarbrücken, the player almost always has access to this mode of location.
Sacré-Cœur on Wikipedia