The abandoned former home of Ante Pavelić – the man they called the ‘Butcher of the Balkans.’

Exploring the tunnels, drains, lost places & underground rivers of the Ukrainian capital.

Underground tourism amongst the ruins of the Byzantine capital.

An illustrated guide to urban exploration in the Russian capital.

Deep beneath a Crimean mountain lurks a derelict nuclear facility that died with the Cold War.

A tale of ropes, waders and security run-ins, on one wild night in the Northern Capital.

After a reported crocodile sighting in Bristol, I ventured down into the sewers for a closer look.

A beautifully preserved Victorian ice well, hidden for more than a century beneath central London.

London as you’ve never seen it before: exploring the hidden infrastructure of the British capital.

Take a tour through a once-secret, Soviet nuclear submarine base – at Balaklava, on the Crimean Pe

The 'Maze Drain': one of Melbourne's largest underground waterways & home to hordes of venomous spid

Exploring the Godstone Main Series Mine: a firestone quarry beneath Surrey, England.

Exploring the world’s largest network of underground tunnels.

A visit to London Below, and the subterranean waterways of the Lost River Effra.

Exploring unfinished communist-era train tunnels beneath the hills of Bulgaria.