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

One of the largest Roman settlements in Portugal.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

This little-known national museum houses over 40,000 works of art from across the world.

This crumbling Portuguese ruin overlooks the populace it once ruled.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

One of the world’s longest pedestrian suspension bridges.

Sip cherry liqueur at a bar dating back to 1840.

One man's remarkable private collection of art from around the world.

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

Dead weights honor the dead of Portugal's fishing industry.

Eat the ultimate iteration of Portugal's most beloved pastry.

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

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

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

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

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

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

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

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

Picturesque intersection of witchcraft and ancient Christianity.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

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

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