The ruins of a coastal fortress sit atop a jagged outcrop along the beaches of Wales - St Catherine's Fort and Island in Pembrokeshire. Experts investigate and uncover a derelict 19th-century British fortification that housed a series of occupants, including an exotic, private zoo.

An eerie ghost village in west-central France, Oradour-sur-Glane, appears as if it were mysteriously abandoned and destroyed all at once; experts investigate and uncover the remains of a derelict settlement left as a memorial to a murderous WWII Nazi raid.