This is one of the doors leading into Meiji Jingu.

When praying at a shrine, you throw a coin into the offering box and clap, to get the attention of the kami. On New Years Day, half of Tokyo comes to Meiji Shrine to pray, and the crowd is so thick that most people can’t reach the offering boxes. So they throw their coins towards the shrine.

Some throw with more enthusiasm than skill, so the surfaces facing the courtyard are pockmarked as high as you can see.