Who built the Great Pyramids of Giza? Why? Are there any secret tunnels and hidden doors inside the Great Pyramid of Khufu? What is the mystery of the so-called Osiris shaft? What is the story of the curse of the Sphinx?
December 10, 2014
The National Underground Railroad Freedom Center (@FreedomCenter) launches a New Modbile App Tour. Visitors can share moments and pictures from their mobile app tour experience via Twitter and Instagram, @FreedomCenter.