The City That Fell Off a Cliff
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It's a free annual bike ride where 1000s ride from Hackney in East London through the night to Dunwich beach.
With many pubs along the way staying open all night and locals putting out little candles it's a magical ride that anyone can do.
(Oh, and it's pronounced Dun-ige to rhyme with midge not Dun-which for anyone wondering.)
It's 180km, so you do need to be reasonably fit. I was on it each year from 2008-2014. Options on the way back are (were?) book a seat on a bus, ride to Saxmundham and get the train from there, ride to Ipswich and get the train from there, or (if you're really fit), ride home. There are a few things to see when you get there, the ruins of Greyfriars Priory, a leper hospital, and a museum.
https://en.wikipedia.org/wiki/Geology_of_England#Superficial...
The "land" that was (and is) being eaten away by the sea - at a seemingly furious pace - is not good bedrock. Nor even "White Cliffs of Dover" soft chalk. It is a mix of sand, clay, random rocks, and such - which glacial action piled up during ice ages. And is now washing away like a big sand castle on the beach, as gravity and a bit of wave action do their natural duties.
But now it's wet much of the year, and soft and squishy. I can dig holes with a trowel, and a delivery truck left ruts trying to drop off materials. Not so stable after all.
https://commons.wikimedia.org/wiki/Category:H%C3%B8jerup_Gam...
> This city was once the same physical size as the City of London with a population, in its late-thirteenth-century heyday, of around ten thousand, before it was savagely diminished by two calamitous sea-storms in 1288 and 1328 initiating a process of coastal erosion that would plunge much of the city off the cliff in the succeeding, sorrowful centuries.
None seem to be effective here: https://www.examinerlive.co.uk/news/local-news/tiny-yorkshir... (lots of other examples on the English East Coast).
You may be able to slow things, but in the end, the sea is going to win.