Chysuaster is a settlement thought to date to the second or third century AD, but with some evidence of occupation dating back to the Iron Age. It contains the remains of a number of courtyard houses and a fogou. The houses comprise of an open courtyard surrounded by a dry stone wall. Against the wall is a round dwelling house with other structures within the courtyard. The nearby fogou is made up of a long excavated trench lined and roofed with granite slabs. There are small stone walled terraces next to the houses which lie within a field system. The site is reached by a footpath from a car park which is on the road between Little Chysauster and Carnaquidden farm. This is northeast of Newmill which is on the road south from the B3306 between Porthmeor and Zennor.