Louis sought a court injunction, but this engineering feat made the Chicago the first river in the world to flow away from its mouth.

FORBES: A most unromantic river

For one thing, building houses narrow enough to fit on a truck while still wide enough to live in is no mean engineering feat.

FORBES: Magazine Article

The tower, built on Piazza del Campo in 1344, was at the time a remarkable engineering feat and one of the tallest nonsectarian towers in Italy (102m).

BBC: Two days in Siena, Italy