Everyone knows the River Liffey passes through the heart of Dublin City. Everyone also is aware of the network of canals which pass through the city.
However what most people are not aware of is the hidden river tunnels within the city which lead into the River Liffey.
These tunnels start off underneath the Dublin castle gardens where there was once a lake. From here they make their way down to the River Liffey passing underneath the Temple Bar area. Check out the short documentary below to learn more!