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Watch the killer strategies that make wild cats possibly the deadliest family on Earth.

Watch the killer strategies that make wild cats possibly the deadliest family on Earth.

The Netherlands: Professor Danielle George explores star fortress Bourtange to discover how it held out against two brutal sieges in the fight for Dutch independence. 16+. (5 of 6)

Poland: Tony Pollard visits the holy site of Jasna Gora to reveal how a monastery survived a brutal siege, while Alina Nowobilska explores the epic Modlin Fortress. 7+. (4 of 6)

Finland: Nautical archaeologist Andy Torbet explores an old sea fort, crucial to Finland's defence, while historian Mika Kulju discovers how the Red Army was defeated in 1940. 7+. (3 of 6)

The Wave: A massive earthquake in the Indian Ocean sets off a tsunami that, within minutes, arrives in the bustling city of Aceh, causing unprecedented havoc and devastation. 7+. (1 of 4)

France: Professor Tony Pollard studies the genius of French fortress construction under Louis XIV, while Arthur Williams discovers why the Maginot Line failed as protection. 12+. (2 of 6)

Katmai: Witness the annual journey of brown bears, wolves and salmon within Katmai National Park - a park founded after the largest volcanic eruption of the 1900s. 7+. (1 of 5)

Katmai: Witness the annual journey of brown bears, wolves and salmon within Katmai National Park - a park founded after the largest volcanic eruption of the 1900s. 7+. (1 of 5)

When an otter in desperate need washes up on his jetty in Shetland, Billy and his wife Susan welcome a unique new member of their family. Heartwarming documentary. 7+.

When an otter in desperate need washes up on his jetty in Shetland, Billy and his wife Susan welcome a unique new member of their family. Heartwarming documentary. 7+.

When an otter in desperate need washes up on his jetty in Shetland, Billy and his wife Susan welcome a unique new member of their family. Heartwarming documentary. 7+.