Abandoned train tunnels 20 metres below the Sydney CBD have been turned into a historic tourist hotspot after a million-dollar makeover by the Minns ...

This massive underwater volcanic tunnel features lava caves, lakes, a concert hall, and a fascinating blend of subterranean ...

Located in the 'Empty Diagonal' with no high-speed rail route in, the volcanic stone city has a fascinating story ...

Sydneysiders and visitors will get to explore these underground tunnels thanks to a mammoth $1-million restoration project.