A century-old tradition has culminated in a small but singular collection of feline effigies.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A cluster of granite granaries perched on stilts.

An ancient Egyptian temple in the middle of Madrid, Spain.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A once-secret library of Freemason history in Catalonia.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Countless stories attempt to explain Poland's mysterious J-shaped trees.