▁the ▁Steph ans dom ▁is ▁the ▁Ha as - H aus , ▁a ▁piece ▁of ▁striking ▁modern ▁architecture ▁by ▁Hans ▁Hol lein . ▁Although ▁public ▁opinion ▁was ▁originally ▁ske pt ical ▁about ▁the ▁combination ▁of ▁the ▁media eval ▁c athedral ▁and ▁the ▁glass ▁and ▁steel ▁building , ▁it ▁is ▁now ▁considered ▁an ▁example ▁of ▁how ▁old ▁and ▁new ▁architecture ▁can ▁mix ▁harm on iously   . ▁ ▁Stock ▁im ▁Eisen ▁ ▁The ▁Stock - im - E isen ▁(" st aff ▁in ▁iron ") ▁is ▁located ▁at ▁the ▁corner ▁of ▁K är nt ner ▁Straße ▁and ▁Gra ben ▁in ▁a ▁n iche ▁on ▁the ▁corner ▁of ▁the ▁Pal ais ▁Equ itable . ▁It ▁is ▁a ▁section ▁of ▁tree ▁tr unk ▁into ▁which ▁hundreds ▁of ▁n ails ▁have ▁been ▁ham mer ed ▁since ▁the ▁Middle ▁A ges , ▁and ▁which ▁is ▁ring ed ▁by ▁an ▁iron ▁band ▁closed ▁by ▁a ▁large ▁pad lock . ▁The ▁earliest ▁written ▁mention ▁of ▁it ▁dates ▁to ▁ 1 5 3 3 ▁and ▁it ▁is ▁the ▁subject ▁of ▁leg ends ▁about ▁the ▁Dev il . ▁ ▁U - B ahn ▁station ▁ ▁The ▁U - B ahn ▁station ▁at ▁Steph ans platz ▁is ▁one ▁of ▁the ▁bus iest ▁in ▁the ▁city , ▁and ▁is ▁the ▁only ▁j unction ▁between ▁the ▁U 1 ▁and ▁U 3 ▁under ground ▁lines . ▁It ▁is ▁also ▁the ▁nearest ▁U - B ahn ▁station ▁to ▁many ▁of ▁the ▁tour ist ▁attra ctions ▁in ▁the ▁city ▁centre . ▁ ▁Vir g il kap elle ▁