This cover from Switzerland depict 2 stamps celebrating the UNESCO site
Rhaetian Railway in the Albula / Bernina Landscapes . The Albula and Bernina lines of the Rhaetian Railway are two historic railway lines that cross the Swiss Alps. They were built in the early 20th century, providing a rapid and easy route into many formerly isolated alpine settlements. Building the railroads required overcoming technical challenges with bridges, galleries, and tunnels. The site is shared with Italy and is inscribed as a UNESCO World Heritage site since 2008.
