The staircase attributed to Leonardo DaVinci, constructed in 1520, at the Chateau de La Rochefoucauld, Charente, France ᘡղbᘠ

The staircase attributed to Leonardo DaVinci, constructed in 1520, at the Chateau de La Rochefoucauld, Charente, France ᘡղbᘠ

Stairs! Any stairs! Indoor, outdoor. Are you familiar with the 'Stairs Formula'? Great article!

Stairs! Any stairs! Indoor, outdoor. Are you familiar with the 'Stairs Formula'? Great article!

Loretto Chapel, Santa Fe, New Mexico, USA http://ukka.co/Santa-Fe--New-Mexico--NM--United-States--US

Loretto Chapel, Santa Fe, New Mexico, USA http://ukka.co/Santa-Fe--New-Mexico--NM--United-States--US

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