The major caves of the Barabar Hills are broadly four in number. Lomas Rishi cave has an arch-like frontage and has extensive timber architecture. The doorway is adorned by a row of elephants proceeding towards stupa emblems, along the curvature of the cave.
The Sudama cave was dedicated by Mauryan Emperor, Ashoka in 261 BC. Its arches are bow shaped and consist of a domed chamber in the midst of a rectangular mandapa. Karna Chaupar is a single room with polished surfaces and could be dated back to 245 BC. Visva Zopri consists of two rectangular rooms.