The Temple of the Warriors complex consists of a large stepped pyramid fronted and flanked by rows of carved columns depicting warriors. This complex is analogous to Temple B at the Toltec capital of Tula, and indicates some form of cultural contact between the two regions. The one at Chichen Itza, however, was constructed on a larger scale. At the top of the stairway on the pyramid's summit (and leading toward the entrance of the pyramid's temple) is a Chac Mool. This temple encases or entombs a former structure called The Temple of the Chac Mool. The archeological expedition and restoration of this building was done by the Carnegie Institution of Washington from 1925 to 1928. A key member of this restoration was Earl H. Morris, who published the work from this expedition in two volumes entitled Temple of the Warriors. Watercolors were made of murals in the Temple of the Warriors that were deteriorating rapidly following exposure to the elements after enduring for centuries in the protected enclosures being discovered. Many depict battle scenes and some even have tantalizing images that lend themselves to speculation and debate by prominent Maya scholars, such as Michael D. Coe and Mary Miller, regarding possible contact with Viking sailors.