As much as Bosnia and Herzegovina are still off the main tourist track, the train from Mostar to Sarajevo(the full length of which originates in Ploce, Croatia on the Adriatic Sea) could still be called a hidden gem. I understand that while the train's two rail cars were largely vacant only a few years ago, they are now full of local passengers and tourists in the summer. In most places I've been, a ride through terrain like that would be marketed as a special tourist day trip. Here it was simply transportation, but over the course of the two-and-a-half hour trip I could hardly look down at my book for fear I'd miss more scenery. 
The portion we rode leaves Mostar through a wide plain along the Neretva River. Heading north, it quickly winds into the deep Neretva River Gorge against the high rock walls that enclose the river. As the tracks climb higher into the gorge, they pass a dam behind which the river takes on a bright blue-green color. Towering jagged rock formations crown the gorge much of the way, revealing a new world around each bend. I didn't realize the Dinaric Alps were so dramatic.
After a lot of switch-backs, the route leaves the river and continues on to Sarajevo high over numerous valleys, passing through over a hundred tunnels along the way. Many of the valleys contain towns, and as we passed over and around them it felt like we were in an airplane preparing for landing.
