OT: A bit of fun:
In 1626, Manhattan was supposedly bought for equivalent of $24 (in beads). If invested at 5% Annual interest, compounded monthly, it would now be worth around $7 billion (assuming my online calculator is working correctly).
So our man should bequeath his $13 + interest and ensure the terms of the will state the the capital + interest is maintained for at least 400 years and someone will be able to inherit a nice tidy sum!