These steps offer a breathtaking view of one of Europe's most besieged fortresses.

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.

This 16th-century house tells the city's history through old artifacts and quirky tales.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Be on the lookout for the symbolic insect all over the city.

Now home to a drinking establishment, this building has a macabre history.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Pilgrimage site for star-crossed lovers.

Pompeii's less famous neighbor is still revealing her secrets.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.