Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

The corpse bride of Portugal.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The oldest Roman lighthouse still in use.

Houses are tucked between, on, and underneath giant boulders.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

One of the largest Roman settlements in Portugal.

The "Little Ones," show Portugal in full miniature splendor.

A majestic hotel for dreamers rises from the center of a fairytale wood.

A 12th century church completely covered in shells.

Picturesque intersection of witchcraft and ancient Christianity.

The stunning interior of this Gothic church is covered in ornate gold details.

Elaborate tile work in this railway station tells the story of Portugal.

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.

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

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A cluster of granite granaries perched on stilts.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

A submerged village appears when dam levels drop.

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