No filters necessary. How I wish this was the norm again. Not all of these photos have dates or credits but they all have one thing in common, they were shot on Kodachrome film...

Garden of the Gods Park. Colorado 1950's. Kodachrome by Chalmers Butterfield
Hollywood 1959

New York 1953
Rome 1952

USA 1955
They even named a State Park after it -Kodachrome Basin State Park, Utah.