The following trips feature caves:
Mid Atlantic Volcanoes - visits Gruta do Carvao lava tube on Sao Miguel Island, Algar do Carvão volcanic pit on Teciera Island this pit is 90 m deep and is literally the inside of a volcano!, Gruta das Torres lava tube on Pico Island.
Jurassic Coast and Cornish tin mines - Visits Kents Cavern and Cheddar Caves
Archeopteryx Adventure with Volcanoes and Geoparks - visits the Laichingen Pothole cave in the Swabian Alb Geopark.
The Birth of Geology - visits Fingal's Cave and Smoo Cave
Gold, Diamonds and Mammal-like Reptiles visits - Sterkfontein Caves in the Cradle of Humankind World Heritage Site.
Cambria: Land of Trilobites, Dragons and Song - VisitsPorth y Ogof cave.
Day Trips - Porth y Ogof Cave is visited on the Fforest Fawr Geopark trip and the Heart of the Park and Waterfall Country Sightseeing Tour.