Square base side

Photo from Wikimedia Commons
Borobudur Temple
The world's largest Buddhist temple in central Java/World Landmarks
Borobudur in Central Java, Indonesia, is the world's largest Buddhist temple, built in the 9th century during the Sailendra dynasty. The monument consists of nine stacked platforms (six square, three circular) topped by a central dome. It is decorated with 2,672 relief panels and 504 Buddha statues. The entire structure was built from approximately 2 million blocks of andesite stone without mortar. Abandoned and buried under volcanic ash for centuries, it was rediscovered in 1814 during the British administration of Java.
Measurements
From base to top of central stupa
Square footprint
Crowning dome
Combined length of all narrative panels
Approximately 2 million stone blocks