The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A submerged village appears when dam levels drop.

A neolithic tomb converted into a tiny chapel.

This crumbling Portuguese ruin overlooks the populace it once ruled.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

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

Pagan monument converted to Christianity with the population.

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This oddly shaped church resembles a rocket.

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

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

A small Portuguese cottage formed between boulders in the countryside.

An honorary saint of the people, Maria Adelaide became an incorrupt corpse, the clothes intact, exhaling “a strong scent of roses.”

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.

Ancient catacombs form the foundation for this Rococo orgy of a church.