Final answer:
A roofed promenade alongside a building's exterior wall is called a portico, a covered structure upheld by columns typically used as a porch.
Step-by-step explanation:
A roofed promenade, especially one extending inside or outside along the exterior wall of a building, is known as a portico. This architectural feature consists of a structure supported by columns, which can be regularly spaced, and is usually attached to a building, serving the purpose of a covered porch. Historical examples of porticos can be seen in classical architecture, such as the Pantheon in Rome, where an imposing portico of monolithic Corinthian columns of Egyptian granite leads to the entrance.
The Pantheon’s portico serves both a functional and an aesthetic role by framing the building’s entrance, providing a transition space from the exterior to the interior, and adding to the grandeur of the structure.