York's city walls were mainly built in the 13th Century and tourists from all over the world now come to walk along the elevated circular route around the city centre for free throughout the year.

New York City is Roberts’ latest subway redesign, the ninth in a series that began last year with the London tube map. “Every large network should always issue two maps,” Roberts said.

Author of the 2013 Walking Guide to York's City Walls, he was more interested in the spectacular vistas enjoyed from aloft. Then he was suddenly made wheelchair dependent by a mystery lung disease.

Retrace York is a trail of nine rubbing plaques positioned at key points around the city’s walls. Each rubbing builds into a complete map of the ancient walls. John Yeomans, chairman of Visit ...

And a new tourist attraction will be launched next month within the city’s walls to tell the story of the world-famous fortifications.

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