Sample port and quinine-fortified wine at this fourth-generation winery near Porto.

Wooden pathways run through this rocky landscape, which legend says was created when a dwarven king pulled down his own castle to stop raiding giants.

Hiding the longest subterranean river known in the world.

Descend into the tunnels to experience the life of a coal miner.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

A road that winds through this natural cave is the only way to access the small, appropriately-named village of Cuevas.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

A spectacular walk on the flank of a gorge.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.