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We travel to the Scottish wilderness in search of spaceships, the Welsh mountains to probe mysterious spheres, a Greek tower with a deadly history, and an Italian hotel perched on a glacier.
More hidden hotels are revealed in Uruguay, Sweden, Scotland, Oman and The Netherlands - from a camouflaged resort perched on the edge of a mountain, to mainland Britain's most isolated hotel.
We uncover some truly remarkable and hidden retreats in Canada, Iceland, Sweden and the UK - from underwater sunken hotels to remote retreats surrounded by lava fields.