This crumbling Portuguese ruin overlooks the populace it once ruled.

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

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

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

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

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

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

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

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

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

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

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

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.

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

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

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

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

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

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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

A submerged village appears when dam levels drop.

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

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