This card was a part of the Keystone View Company's Tour of the World Series. Given the inclusion of a picture of a completed Mt Rushmore but lack of reference to WWII, this set dates from about 1939; however, the individual pictures are likely from a range of years. Keystone View Company was the largest producer of stereoscopes and image cards beginning in 1903 and several sets of cards were sold often with stereoscopes. The cards include a description of the subject matter on the backside.
Title: The Magnificent Facade and the Towers (517 Feet) of the Cathedral of Koln, Germany. Number: 348
Condition: There is some wear along the edges of the card which is more pronounced on the left side.