In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

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

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A unique seaside cave where Aleister Crowley faked his own death.

Perhaps the most spectacular grotto along the Algarve coastline.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

A hidden three-foot-wide house separates these two regal churches.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A small Portuguese cottage formed between boulders in the countryside.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.