My freind Jai says:

I placed the first SamStone in Plaza San Martin, a park located in the Retiro neighbourhood of Buenos Aires.  The park commemorates General Don Jose de San Martin, known as he liberator of Argentina, Peru and Chile, The French landscaper Charles Thays designed the upper side of the plaza where the equestrian bronze monument of San Martin is located. This is a very popular park and one can see students, tourists, business folks, readers and children here. The first and last pictures in this set of 5 show different views of the monument, and the middle three pictures show where I placed the Samstone at the base of the monument. Picture #132 shows the best view of the Sam Stone.