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Two gritty teams of hobbyist cavers attempt to break records for the longest and deepest caves in Canada.

The hidden history of Singapore includes the secret symbolism behind the city's success and the stealthy jungle predator behind an 1860s rampage.

Ray journeys to the magnificent Isle of Skye in search of Britain's rarest bird of prey, the spectacular sea eagle.

Paris' remarkable secrets include the Phantom of the Opera's connection to the flood of the century as well as the remnants of one of history's most terrifying inventions.

Ray uses the Derwent River as his guide to the breathtaking Borrowdale valley, a place of ancient rainforests and home to some very special wildlife, including peregrine falcons.

Berlin's secrets include the surprising story behind the statue on top of the Brandenburg Gate and brewery tunnels that helped East Berliners escape.