The architecture of Sri Lanka displays a rich variety of architectural forms and styles. Buddhism has had a significant influence on Sri Lankan architecture, since it was introduced to the island in the 3rd Century BCE.
Traditionally, Indian and East Asian architecture have been the most significant forms of foreign influence on Sri Lankan architecture and both have played a significant role in shaping it. Architectural influences from Southeast Asia have also had an impact on the development of Sri Lankan architecture. Techniques and styles developed in Europe, transported to the country via colonialism, also played a major role in the architecture of Sri Lanka later on.
The earliest evidence of cave temples are found in the temple complexes of Mihintale. A unique feature in these caves was the use of a drip ledge carved along the top edge of the rock ceiling which stopped rain water running into the cave. With time, doors, windows and walls of brick or stone were added. The roof and walls were plastered white and finished with decorative paintings, these are evident in the cave temples of Dambulla. Chipped material of the rock packed underneath the clay finished floor.
Cave complexes of Dambulla and Situlpahuwa contained 80 caves each, The Kaludiya Pokuna, Mihintale cave temple is constructed with brick walls, granite window openings, and ceilings. The Gal vihara, Polonnaruwa and the cave temples of Dambulla were initially constructed as cave temples, later on the cave temples were converted to image houses.
The dagobas or stupas are distinctive for many reasons. They are probably the largest brick structures known to the pre-modern world. Demala Maha Seya, which was never completed, had a circumference of 2,011 feet (613 m). Jetavanaramaya is the largest stupa constructed in any part of the world. It is over 120 metres in height and has a diameter of 367 feet (112 m). The foundations are 28 feet (9 m) deep. It needed bricks that could bear the load of 368 pounds. Jetavanarama was the third tallest building in the ancient world. Abhayagiri Dagaba (370 ft) ranked fifth and Ruwanwelisaya (300 ft) came seventh (the first, fourth and sixth places were held by the Pyramids of Giza).