World's Most Extreme Homes

Ruth meets the owners of a Victorian water tower converted into an eight-story home in Scotland, a once-derelict Irish church turned into an open floor plan home and a coastal South African nautical retreat.

Ruth goes inside a London church tower turned luxury home, a stylish four-story treehouse in South Africa and an off-grid twisty wood house in rural France.

Ruth tours one of the oldest windmills in Holland, an playful open air home made from different vehicles in Australia and an Elizabethan mansion in the Cornwall countryside.

An old cargo barge is renovated into a ultra-modern houseboat, a rusty Victorian water tank is made into a three-story luxury home and a large tree house brings a Tibetan aesthetic to Australia.

Ruth goes inside a bridge house built by a Finnish biologist, a zigzag minimalist home in Chile and a tug boar that's been converted into an eclectic three bedroom home.

Ruth visits a Victorian water tower that's been converted into an architect's home, a concrete spaceship in a posh Australian suburb and an imposing Grecian-style home on an exclusive New Zealand island.

Victoria visits a brand new medieval castle in England, an inside-outside home in Australia with a sleeper train and an open plan minimalist home in South Africa.

Ruth explores a restored medieval castle in the Scottish highlands, a modern glass home perched on a Alpine cliff and next generation studio apartment in England.

Ruth goes inside a funky French house stuck in the '70s, a wild Brazilian rain forest home in the treetops and a quaint cottage made from traditional cob in England.

Ruth tours a home that bends all the rules in England, an underground shark home in Mexico City and a hand-constructed mud castle in the New Zealand countryside.

Ruth visits a 10th century Tuscan castle owned by the same family for 900 years, a found object sculptor's customized home in South Africa and a modernist curved house in London.

Ruth explores a modern and eccentric fairy tale castle in Switzerland, a minimalist bungalow squeezed onto a small London plot and a high tech home on a South African nature reserve.

Ruth checks out a sustainable woodsman's home in England, a modernist bird's nest in Austria and a subterranean home carved into the side of a Spanish mountain.