An alien church provides much needed silence in the midst of a Finland shopping center.

A subterranean house of worship carved right out of the bedrock.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

A mud brick kasbah with a history of lavishness and traitorship.

God's Saharan sandbox of wrath.

A fortified city, home to a remaining population of five families

One of the most spectacular canyons in the world.

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

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

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

A majestic hotel for dreamers rises from the center of a fairytale wood.

One of the largest Roman settlements in Portugal.

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

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

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

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

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

Houses are tucked between, on, and underneath giant boulders.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Week-long block party becomes a competition for the best decorated street.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.