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Deutsche Post - Expo Hanover 2000

The tallest tower of Expo 2000 at 46.5 metres.

In fact, this building represented a giant mailbox, where the answers to the question "How do you see the future in the 21st century" were posted.

These answers were collected during Hubert's second round-the-world bike ride.

All the answers to the question were posted virtually in the mailbox and made up the longest letter in the world.