Today, they are replacing the missing marble with new marble from the very quarry used in the original construction. And to hold pieces together, non-corrosive titanium rods
The columns were built by stacking huge pieces of marble. Contemporary technology revealed that – even though the columns looked proper – they were re-constructed wrong. Parts of the first column were stacked in the second and third. Parts of the second column, in the first and fifth, etc.
Re-construction teams had to take apart the former construction and re-assemble the columns properly. Wow.
The Parthenon inspires. Makes me wonder what 20th or 21st Century construction will exist in the year 4,500?