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

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

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

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

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

A neolithic tomb converted into a tiny chapel.

Picturesque intersection of witchcraft and ancient Christianity.

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

This crumbling Portuguese ruin overlooks the populace it once ruled.

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

The corpse bride of Portugal.

This star-shaped military outpost is now simply trying to protect itself from neglect.

One of the largest Roman settlements in Portugal.

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

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

The world's tallest bridge is also possibly the most elegant.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

This ancient theater was once the home of fierce gladiatorial battles.