A map of Italy made entirely of trees.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

One of the most well-known city festivals in the world.

A thought-provoking outdoor art installation sits in the seat of German law.

A student driver's nightmare.