The seven-thousand-square-metre Plaza Mayor Monument · Lerma, Arlanza, Burgos Image of Lerma, not of the place itself. One of the most extensive main squares in Spain, originally arcaded on all four sides. It served as a market, a bullring and a theatre; Lope de Vega described it as a beautiful square that looked like a painting. Photo: Jl FilpoC (CC BY-SA 4.0) What to see and do in Lerma