Maybrook is a mansion and property located in Wynnewood, Lower Merion Township, Pennsylvania in the Main Line suburban region just outside of Philadelphia. The mansion was built in 1881 as a summer home by liquor baron and real estate developer Henry C. Gibson and his wife, Mary B. Klett and six-year-old daughter Mary Klett "May" Gibson. Gibson named the property for his little daughter and the brook that runs through it.