A turquoise lake within a volcanic crater.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

A geological oddity topped with a 2,000-year-old pagan temple.

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

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

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Construction of Barcelona’s iconic (but controversial) church was finally 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.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chornobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This derelict superstructure was a very important warning system for the Soviet military.

A local landmark with generations of spraypainted messages, and more being added each day.

A beautiful young girl said to have been buried alive in her coffin…

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

A pocket of Buenos Aires with an unusually high concentration of psychotherapists.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.