A majestic vacation estate for the rich and powerful now lies abandoned in the highlands of Argentina - the Hotel Edén in Córdoba Province. Experts investigate and uncover a once struggling hotel transformed into a luxurious resort outpost for elite Nazi German sympathizers. 

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.