▁that ▁symbol ize ▁the ▁confl u ence ▁of ▁Zw ief alter - A ach ▁and ▁the ▁K essel - A ach . ▁The ▁seven ▁golden ▁stars ▁are ▁from ▁the ▁arms ▁of ▁the ▁former ▁counts ▁of ▁Ach alm . ▁ ▁T win ning ▁Zw ief al ten ▁is ▁tw inned ▁with ▁La ▁T ess ou alle , ▁France , ▁since ▁August ▁ 1 2 , ▁ 1 9 7 3 ▁ ▁Things ▁Ab bey ▁Zw ief al ten ▁Zw ief al ten ▁is ▁located ▁on ▁the ▁Upper ▁Sw ab ian ▁Bar o que ▁Route . ▁ ▁Museum s ▁Wür ttemberg ian ▁Psych iat ry ▁Museum ▁Peter st orm useum : ▁Local ▁museum ▁in ▁the ▁former ▁school ▁building ▁ ▁History ▁F ounded ▁at ▁the ▁confl u ence ▁of ▁two ▁rivers , ▁Zw iv alt um ▁was ▁mentioned ▁for ▁the ▁first ▁time ▁in ▁a ▁document ▁by ▁King ▁Ludwig ▁IV ▁dated ▁ 1 5 ▁June ▁ 9 0 4 , ▁but ▁the ▁town ' s ▁claim ▁to ▁fame ▁is ▁its ▁former ▁Bened ict ine ▁monaster y , ▁the ▁Zw ief al ten ▁Ab bey , ▁which ▁was ▁founded ▁in ▁ 1 0 8 9 ▁by ▁mon ks ▁from ▁H irs au . ▁Count s ▁L uit old ▁von ▁Ach alm ▁and ▁K uno ▁von ▁W ül fl ingen ▁gave ▁extensive ▁don ations ▁the ▁monaster y . ▁There ▁was ▁also ▁at ▁one ▁time ▁a ▁convent ▁on ▁the ▁spot , ▁but ▁by ▁the ▁ 1 4 th ▁century ▁it ▁was ▁no ▁longer ▁there . ▁Until ▁the ▁ 1 5