The Mexico City National Cemetery:

is located at 31 Virginia Fabregas, Colonia San Rafael, Mexico City, Mexico.  It is about two miles west of the Metropolitan Cathedral and about one mile north of the United States Embassy.  The cemetery was established in 1851 by Congress to gather the American Dead of the Mexican War that lay in the nearby fields and to provide burial space for Americans that died in the vicinity.  A total of 750 unknown American soldiers were gathered and buried in a common grave at the cemetery.  A small monument was placed over them that carries the inscription:

TO THE HONORED MEMORY OF 750 AMERICANS KNOWN BUT TO GOD WHOSE BONES COLLECTED BY THEIR COUNTRY'S ORDER ARE HERE BURIED

In this one acre area are also placed 813 remains of Americans and others in wall crypts on either side of the cemetery.  The cemetery was closed for further burials in 1923.