Just under four miles away from Bradwell, along the A6187 is Castleton, one of Derbyshire’s gems, in more ways than one; it is here where you can buy fine examples of the county’s famous Blue John Fluorspar, which was mined in the village. This beautiful semi-precious stone can be seen in its natural splendour in Blue John and Treak Cliff, two of the four caverns in the village.
Lying 16 miles west of Sheffield in the Hope Valley, Castleton is in the shadow of the majestic Mam Tor also known as the ‘Shivering Mountain’ because it has been unstable for the past 4,000 years! The village’s limestone buildings huddle in neat formation around the green with its war memorial cross. St. Edmunds is a fine example of a Norman church, restored in 1837.
The four show caves are each very different ; Peak Cavern (the largest open cavern in Britain) celebrates the life and work of rope makers. Because of its wonderful acoustics it has been used to host musical concerts and even a wedding.  Speedwell Cavern at the foot of Winnats Pass is a very different experience altogether involving a one hundred step journey down into a dark tunnel then onto a boat from which you can admire the rock formations formed by the action of water on limestone.
The ruins of Peveril Castle, built by William the Conqueror, but given to his son in 1086 cling to the side of Cavedale, which has breathtaking views.
Back in the village, winding lanes and footpaths all lead to the main street that is lined with gift shops, where you can purchase Blue John jewellery and ornaments.
Castleton boasts no fewer than six pubs and a number of cafes to refresh the weary tourist.
A mile along the road from Bradwell is the tiny hamlet of Brough, which as well as a handful of stone cottages boasts a site with some Roman remains. Situated in a flat, green field, above a sharp bend in the River Noe, is the site of a small Roman Fort.  It was called Navio in Latin inscriptions, a name that means “on the river” and the likelihood is that it was put here to guard the crossing point, but on slightly higher ground, for strategic advantage.  Originally constructed from wood in the first century AD, it was later partly rebuilt later in stone and some of this is still visible, especially at the centre of the site; stones that look at first glance to be an old water trough are in fact the entrance to the underground strong room that was at the very heart of the fortification.  Also clearly discernible are the outer boundaries of the fort, laid out in a perfect square and parts of these reveal more stonework.