Round Hill VA came about in 1900 as a terminus for a railroad line. The town is on Hwy 7, NW of Washington D.C.
This card is well over a century old. It is one of those fine, German-printed cards from before the start of WWI. A broad, general guess would put it to 1910 or so.
On the back: Publ. by Wallace’s Pharmacy, Round Hill, Va. No. 21 Made in Germany
That’s Wallace Pharmacy with the Coca-Cola sign on the left. The card is in pretty good shape for its age.
Uncle Bob's Pix 