A house of cards (also known as a card tower or a card castle) is a structure created by stacking playing cards on top of each other pyramidally. "House of cards" is also an expression that dates back to 1645 meaning a structure or argument built on a shaky foundation or one that will collapse if a necessary (but possibly overlooked or unappreciated) element is removed.

Bryan Berg (born March 21, 1974) is an American professional "cardstacker" who builds large-scale houses of cards.

On November 6, 1999, Berg built a taller tower for the German edition of Guinness Prime Time in the lobby of the casino at Potsdamer Platz, Berlin. That tower was approximately 25.29 feet (7.71 meters) tall and required over 1700 decks to stack up to 131 stories.

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