Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

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

A cluster of granite granaries perched on stilts.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

An extravagant monument to an extravagantly unpopular Emperor.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Hiding the longest subterranean river known in the world.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

This cheese shop also houses a museum devoted to Dutch dairy.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

A small but charming botanical garden that contains many exotic plant species.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

Rows of stone statues are dressed up to mourn children that are lost before birth.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

When the rain falls, this drain system turns into a musical instrument.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.