A historic scientific breakthrough that crosses nine borders.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

This park built on a former fortress has a reputation for romance.

A unique sculpture calls the outside of this steakhouse home.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

The Guardian of Tallinn.

The oldest continuously operating pharmacy in Europe.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

Rubbing the buttons along this statue's coat is considered good luck.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

A medieval setting reimagined into a unique art alley.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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.

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

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

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

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.