Bottom of Gaping Gill, Yorkshire. Britain's highest unbroken waterfall plunges 328 ft into Gaping Gill, one of Britain's largest and most complex cave systems.<- It's a dream of mine to explore caves. "the descent" style.
Fingal’s Cave, Inner Hebrides, Scotland. "Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, part of a National Nature Reserve owned by the National Trust for Scotland" via Wikipedia.