As art lovers crowd into museums and galleries, many of the world's great paintings and sculptures are hidden away in private collections, rarely seen or admired except by the owners and their guests.
In this series, Alvin Hall seeks out the world's most glittering private art collections and finds out from the collectors what motivates them: is it a canny investment, or the thrill of the chase?A visit to a man with so much art, he has to hang it on the ceiling and the toilet door.
Alvin meets two people who collect cutting edge contemporary art - including a urine yellow sculpture of a toilet.
Alvin Hall visits the Hort family collection in NEW YORK, one of best contemporary art collections in the world.
A look at a different kind of secret collection - Deutsche Bank's huge corporate art collection.
Alvin meets two New York art collectors who collect art on a budget.