Vintage 1950s Skyline Caverns Postcards (Set of 2) Orchids & Cathedral Hall VA

Pair of 2 vintage chrome postcards from Skyline Caverns, Front Royal, Virginia, published by Colourpicture Publishers, Boston. • "Orchids of the Mineral Kingdom" — rare anthodite crystal formations, unique to Skyline Caverns • "Cathedral Hall" — magnificent chamber, brilliant in color and form • Copyright 1950s–1960s, photography by Lewis E. Allen • Unused, unposted backs in excellent vintage condition