Pataliputra — Capital of Five Empires – 3D Interactive Model | UPSC GS-I History · Ancient India (Bihar special)

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Explode

Cross-section

Wooden palisade (570 towers!)
Moat & Ganga-Son rivers
80 polished pillars (Kumhrar)
City grounds

Slide Explode to lift the 80-pillared hall's roof · note the wooden walls & moat

Source: Megasthenes' Indica, Arthashastra & Kumhrar-Bulandi Bagh excavations · Interactive 3D learning model

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