University of Cincinnati. "How ancient artists used palace floor as a creative canvas." ScienceDaily. ScienceDaily, 3 January 2014. <www.sciencedaily.com / releases / 2014 / 01 / 140103204508.htm>.

A robot filmed colored symbols inside a sealed chamber reached by navigating a sixty meter, twenty centimeter square shaft, fueling debate over the structure's ritual purpose.

Study of Sticky Rice-Lime Mortar Technology for the Restoration of Historical Masonry Construction. Accounts of Chemical Research, 2010; 100510131945076 DOI: 10.1021/ar9001944 ...

Many ancient walls, which appear in various forms all over the world from Greece to Peru, look cobbled together haphazardly–not a building technique seemingly fit for the modern world.