But how many of them have you heard about?
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1. The Hole in the Road
The Hole in the Road was filled in during 1994 to accommodate the Castle Square Supertram stop. Photo: JPI Media
2. The Bear Pit
Located in Sheffield's Botanical Gardens, the Bear Pit is described as the country's finest surviving example and dates from the 1830s. It is rumoured that a child died in 1870 after falling in and being savaged. Photo: JPI Media
3. Wicker Arches
This Grade II*-listed structure dates from 1848. Photo: JPI Media
4. Megatron
A brick-vaulted "cathedral" often called the Megatron and located beneath Midland Station, it forms part of a labyrinth of underground rivers beneath the city. Photo: JPI Media