An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

Panoramic views from the mountains over a facility built to provide tuberculosis patients with fresh mountain air.

This impressive rupestrian engraving dates back to the Upper Palaeolithic period.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

A 19th-century mansion houses the largest collection of gin in the European Union.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A cluster of granite granaries perched on stilts.

This crumbling Portuguese ruin overlooks the populace it once ruled.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

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

This abandoned five-star hotel is now a five-star urban exploration destination.

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

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

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

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

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

Picturesque intersection of witchcraft and ancient Christianity.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Perhaps the most spectacular grotto along the Algarve coastline.

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