The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

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.

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

One of the largest Roman settlements in Portugal.

This crumbling Portuguese ruin overlooks the populace it once ruled.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

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

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

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

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

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

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

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

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

Black cat statues guard this temple-like Egyptian revival factory.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Modern art meets modern convenience in possibly the world's most architecturally important public bathroom.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.