A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An abandoned mining complex in Serra do Gerês.

On a trail in Portugal's Barão de São João National Forest, a pile of faces look up at hikers from the forest floor.

Bits of flat terrain surrounded by cliffs make one of the most beautiful landscapes in the Azores.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

A glacial valley filled with silver beech trees in the mountains of Portugal.

Panoramic views from the mountains over a facility built to provide tuberculosis patients with fresh mountain air.

For more than two centuries, the canopy of this venerable tree has been a haven for songbirds and lovers.

An 11th-century medieval castle cascades over the town of Numão.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

These small, triangular, colorful houses are a staple of Madeira Island.

A fortress off the West coast of Portugal that dates back to 1502.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

This architectural beauty is the home to a personal collection of more than 600 examples of mechanical musical instruments.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

A micronation on an islet along the coast of a Portuguese island.

Europe's oldest still-operational tea farm also boasts a spectacular view.

A 19th-century mansion houses the largest collection of gin in the European Union.

A lush oasis full of vibrant plants and striking geometric displays.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.