Exploring the dimly-lit tunnels created during Napoleonic times.
A 12-pounder cannon, one of the many cannons that still protects the interior of the fort.
The Main Magazine held some 1,000 barrels of gunpowder -- similar to those on display.
Then, after 2 hours of exploring the fort, this very enjoyable tour finished with a walk back to the Visitor Centre and a welcome cup of tea.