Zoomable 3D model of the world's busiest train station, Shinjuku in Tokyo

Take a look.

From Wikipedia:

3.6 million passengers per day pass through Shinjuku station.

The main East Japan Railway Company station and the directly adjacent private railways have a total of 35 platforms, an underground arcade, above-ground arcade and numerous hallways with another 17 platforms (52 total) that can be accessed through hallways to five directly connected stations without surfacing outside.

The entire above/underground complex has well over 200 exits.