The most loyal of little dogs, or a Victorian era publicity stunt?

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Apartment complexes built into huge repurposed natural gas tanks.

Op-art architecture designed for happiness.

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

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.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

Constructed on the ruins of a convent, this tower saved countless lives.

A bright little alley in La Boca is a part of tango history.

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

An artist's mausoleum with a haunting echo.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This floating sculpture of ice is a poignant reminder of nature's power.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A massively oversized measuring tape sculpture sits inside a hidden yard.

An operating lighthouse from the 1860s.