This week's photo challenge was an easy one—particularly if you're up on the history of famous Main Line mansions. The building in the c. 1900 photograph we posted on Monday is Ballytore Castle, the former home of department store founder Isaac Clothier. The building is currently St. Sahag & St. Mesrob Armenian Apostolic Church.

Ballytore, located on Wynnewood Road near Lancaster Avenue, was built for the Strawbridge & Clothier founder in 1885 by Addison Hutton, who also designed much of the Bryn Mawr and Haverford College campuses, according to the Lower Merion Historical Society.

Clothier lived in Ballytore until his death in 1921. In 1933, the building was rented to the Agnes Irwin School, and the school purchased the building in 1936. In 1963, the building was purchased by St. Sahag & St. Mesrob Armenian Apostolic Church.

For a more extensive history of Ballytore, read Ardmore Patch's feature on the building.

We had four guesses for our historical photo challenge this week, and all of them were right. Kudos to Patch users Jack Kerr, Mildred Roberts, Kurt Gutzler and Kit Grundstein for getting the location correct.

Check back Monday for a new historical photo challenge.