The Malham Dig (2016)

Malham Cove and Tarn are pretty amazing in their own right. Before the river sank (~12,000 years ago) this would have been a 250ft tall 1000ft wide waterfall. For reference this is about 1/3 as wide as Niagara falls, but 100' taller.

https://en.wikipedia.org/wiki/Malham_Cove