World's Most Secret Hotels

1. Extreme Escapes

In Cambodia we visit the Shinta Mani Wild hotel on the banks of the Timor Rung River, and in Italy, a clifftop settlement that's hewn into the limestone rocks.

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2. Remote Hideaways

We uncover more unique and unusual hotels in Jordan, England, Sweden and Ecuador, including the Bubble Wadi Rum Luxotel resort that resembles a colony on Mars and a converted plane.

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3. Hidden Escapes

We visit the TWA Hotel, hidden within one of New York's busiest airport runways, and Kakslauttanen Arctic Resort's glass igloos in Finnish Lapland.

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4. Invisible Hideaways

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.

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5. Hilltop Escapes

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.

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6. Hidden Retreats

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.

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