A 25-minute walk or short bus ride from central Nova Gorica gets you to the small village of Solkan, where the Soca river runs under one of the most graceful pieces of railway engineering in Europe. The single limestone arch stretches 85 metres across the river, with the whole span 220 metres long. Trains still cross it on the line between Nova Gorica and Bled.
The footpath under the bridge gives the best view, especially in late spring when the Soca runs its full electric turquoise. You can also kayak under it — Solkan is one of the put-in points for trips down the Soca, and the rapids just downstream were used for the 1991 World Whitewater Championships.