The Great Sphinx of Giza is the largest monolith statue in the world, standing 241 ft long, 63 ft wide and 66 ft high.
It is also the oldest known monumental sculpture, and is believed to have been built by ancient Egyptians in about 2550 BC.
The upper photos were taken before the concrete support was added to the bottom of the headdress in the 1920s.
The lower photos were taken after the 1920s restoration.
From a report at the link below:
Attempts to restore the Sphinx have often caused more harm than good. In the 1920s it was deemed necessary to support the head with cement approximations of the absent parts of the headdress, and it is these extensions that chiefly account for the altered appearance of the Sphinx's head in recent times, when compared with old photographs and drawings.