One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

Longest fortress system anywhere in Europe.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Where Venice's gondolas go for a tune-up.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

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

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

This tower once served as a radar station during the Cold War.

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

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

One of the world’s longest pedestrian suspension bridges.

This castle has links to Portugal’s founding and struggles for independence.

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.

This giant sculpture made of trash is a critique of society's wastefulness.

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

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

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

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