The steps leading up to the Temple of Hathor at Dendera complex. See anything strange?
Over 2300 years, many feet stepped over these stones and left an impression of a melted look. It can be quite difficult to accept that this is simply a phenomenon caused by the natural erosion of feet over thousands of years. But it is.
More outlandish theories as to why these steps appear to be melted include the assumption that a nuclear war once took place during antiquity. There is, of course, no evidence to back up this hypothesis and is merely a pseudoscientific stab in the dark.
There is some speculation that Hathor Temple is actually built over an even more ancient site which gives credence as to why the stairs appear so much older than the walls.