As some people may be aware, the UK has an extensive canal system, which helpt in facilitate the Industrial Revolution due to its use as a mass transport system. Over the years rail and road networks overtook the canals as a means of transit, however in recent uses there have been a number of heritage projects to restore the network, for leisure uses and as means to preserve history.
One of such restoration has occurred at the junction of the Forth and Clyde Canal (linking the east and west coasts of Scotland ) and the Union Canal (links Edinburgh to the Forth and Clyde). This is the Falkirk Wheel, a rotating boat lift, which lifts boats 24m (79ft) from one canal to the over. Previously, there had been a series of 11 locks, however, by the 1930's these had fallan into disuse. During the 70s and 80s it was decided to make the canals navigable again, with designs for replacing the previous locks being taken in the 90s.
There is a great video by Tom Scott on how the wheel works:
A short walk from marvel of 21st century engineering is one which dates from the 2nd Century AD. Rough Castle, is one of the forts of the Antonine Wall (Hadrian's Wall lesser known cousin, which is further north). Not much remains, but can still see the building works in the ground