Embedded in the historic facade of Chicago’s Tribune Tower is a world-tour of famous monuments and highlights of history. On one extreme, a 4600-year-old building block once supported pharaohs as part of the Great Pyramid of Giza. On the other, a twisted steel beam memorializes the tragedy of September 11, 2001. Along the way, visitors experience pieces of the Great Wall of China, the White House, the Kremlin, Notre Dame, the Taj Mahal, the Alamo, Westminster . . . In all, 150 stones cover all 50 states and 37 countries along with a piece of Antarctica and a rock from the Moon! *currently temporarily removed from display. Using a sleek custom panoramic locator, this app guides visitors to the collection, provides details, background information, search, and beautiful images of the stones and the buildings to which they once belonged.