The Royal Engineers designed, but did not build, the Royal Albert Hall. They've built a fair number of sea defences in Britain and around the world, though none

The Royal Engineers designed, but did not build, the Royal Albert Hall. They've built a fair number of sea defences in Britain and around the world, though none in recent times. Back in colonial times they built much infrastructure, including administrative buildings, irrigation, dams and canals in a number of places, probably most in India and Canada. There's also the Ordnance Survey that came out of the RE and surveyed a good part of the globe. There's trig points all over the planet.