These two caves are part of the Creswell Crags limestone gorge and cave system in Nottinghamshire, England and they feature the only cave art in Britain! These caves were inhabited for many years and have yielded artifacts that range in age from 10,000 to 50,000 years old. The caves have been studied since the 1870's, but the art in Church Hole was not discovered until 2003. There are a few dozen engravings of stag, bison, birds, and some geometric signs. Uranium/thorium dating has shown that they are about 13,000 years old.
Creswell Crags is an outdoor site that is free to visit, but you must buy a ticket if you want to tour the caves or visit their modern exhibition center, which houses real artifacts from the site. Cave tours are only offered on weekends, and there are no tours of Church Hole from October to February. Church Hole is the only one with art, save for a small triangle on the wall just inside the entrance of Robin Hood Cave. A cave tour includes admission to the museum, and you can tour both caves in the same day. And they let you take pictures in the caves!!!
Reservations are strongly recommended. There are some stairs inside and outside the caves.