As I wrote in the Wikipedia Article about Robertsfield, Monrovia was for many years one of Pan Am's principal focus cities in Africa, until the economy stagnated under Doe in the mid-1980s.
I had this old edition of Pan Am's New Horizon's World Guide from 1963 for some time, but it was only recently that I looked at the page for Liberia. The Ducor Hotel is mentioned, for as much as $10 a night! Other than that, nothing is particularly recognizable, although it'd be great to know about these other spots, and just where 80 Broad Street is, where Pan Am's G.S.A. was located.