Some of the world's most spectacular houses ever built - from a modern Italian castle to a seaside house made of refrigerator panels, from a floating home that was a ferry boat to a spherical house that revolves with the sun - and find out what makes them all so unique.

An up-close look at some of the world's most spectacular houses ever built - from a home carved right into the side of a red rock canyon to one that is built completely underground, from a home suspended in mid-air to one that is concrete from the floors to the furniture .

An up-close look at some of the world's most spectacular houses ever built - from a cliffside home perched on top of a waterfall to one that is built out of cargo containers, from a home in the middle of a Brazilian rain forest to one that looks like a whale - and find out what makes them all so unique.

A castle made of mud; a sphere-shaped home; a home built deep within a cave; a home looks like a snake.

A Brazilian home shaped like a white box; a palatial snow palace in Vermont; a Phoenix oasis; a pod house in New York; accordion house; underground, flower-shaped home; moveable home; Easter eggs; a castle on the sand.

A house with six giant leaves for a roof in Brazil, one in Spain inspired by a freeway, a home in the Arizona desert shaped like a scorpion and playing with kids' blocks led to the Rolling Dice House in Australia.