If there was a Mount Rushmore of Bosnia & Herzegovina’s Ottoman bridges, Trebinje’s Arslanagić Bridge would undoubtedly be found there. This is a real marvel of Ottoman bridge-building, completed way back in 1574. It was actually originally placed some 10km upstream, but the construction of a hydro-power plant in the 1960s saw it flooded. The bridge was dismantled piece by piece and moved to its current position, a spot much more accessible for visitors to the town. The actual name of the bridge in the modern age is the Perović Bridge, but its common colloquial name comes from a 17th century chap who set up a toll booth on its stones. There is no toll today, and this unique double-backed beauty is free for gawping at all year long.