Wild Castles

Explore the historic home of an extraordinary family of birds of prey in a look at the wildlife living in the nature reserve surrounding Germany's Heidelberg Castle. (S1, ep 1) Also in UHD

Flocks of birds, families of wild boar and armies of insects thrive in and around this centuries-old fortress. And years of human inhabitants haven't put them off. (S1, ep 2) Also in UHD.

In Slovenia lies the world's largest castle that's carved into a cave - a subterranean haven for the region's birds, boars and mountain goats. (S1, ep 3) Also in UHD.

A refuge for Grenada's wildlife, Alhambra's fortress provides the backdrop for the daily dramas and struggles of the region's amphibians, fish and birds. (S1, ep 4) Also in UHD.

From swans to Alpine ibex, explore the creatures that have called one of Germany's most visited castles and attractions their home for centuries. (S1, ep 5) Also in UHD.