Just a short walk North of the ruins of the Royal Palace, lies the area known as Quadrangle, which is the ruins of ancient buildings, located on the raised area bounded by a wall. There is the largest concentration of centuries-old architectural heritage, which you will see in the ancient cities. Besides the ruins there also is a house of images, the bodhisattva temple and the Holy Bodhi tree. To set foot on this land, as in other shrines, only barefoot.

In the Southeast of the quadrangle is vatadage (round house relics) typical for Sri Lanka. Its outdoor terrace is 18m in diameter, and a second terrace has four inputs, which are the stone guards. The moonstone at the North entrance is considered the best in Polonnaruwa. Four entrances lead to the Central vault of relics with four seated Buddhas. Stone shield is considered a later addition to the home of relics. He was probably made when Nissanka Malle.

In the southern part of the quadrangle is Thuparama Gedige, or a house of images, the smallest gedige (hollow Buddhist temple with thick walls) in Polonnaruwa. The roof has preserved unchanged. It was built in the reign of Parakramabahu I. Inside there are several Buddha images, but they are barely visible in daylight.

Gal Pot (Stone book), is located to the East of the house of relics and is a colossal stone image of the book “Ola”. Length totals 9 m, width - 1, 5 m, and the thickness from 40 cm to 66 cm. the Inscription indicates that this edition of Nissanka Malla. Most of his praises of his virtues as a king, but the footnote also States that the stove weighs 25 tons and pulled it from Mihintale.

In addition, built by Nissanka Mallom the temple to the main Buddhist relic, a tooth of the Buddha, according to legend was built for 60 days.

Nissanka Malla was also responsible for Lata-Mandapaya. This unique structure consists of a lattice of a stone fence, imitating the wooden fence with inscriptions and railing and the small repository for relics. The vault is surrounded by stone pillars in the shape of a Lotus stems which are topped with closed buds. The story goes that Nissanka Malla often sat in this building and enjoyed the Buddhist texts.

Almost nothing was known about Samakal Prasad. It is made in the form of the step pyramid of six stories, each smaller than the previous (first of seven).

The temple of the Tooth relic - etalage (translated from Sinhala means the eighth house of the tooth relic) is the only extant in Polonnaruwa structures built during the reign of Vijayabahu I.