He built another tower in the College of Design's atrium at Iowa State University in 1998. It stood at approximately tall and used over 1500 decks of standard cards weighing over . It took two and a half weeks to build working in shifts from four to twelve hours each day. During construction, the tower was surrounded by scaffolding. 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 tall and required over 1700 decks to stack up to 131 stories.