When he died in that men's room in Penn Station, 30 years ago, he was on his way back from Dacca.

WSJ: Seeking the Father, Finding the Architect

Seated in Kahn's Assembly Building in Dacca, Bangladesh, a professor of architecture, Shamsul Wares, tells Nathaniel that his father "was no ordinary man, " and gives a passionate recital of how the architect's vision conjured great buildings out of desolate, empty land.

WSJ: Seeking the Father, Finding the Architect