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

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The fragmented remains of a massive public bath connected to the city's water supply.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This Parisian café sticks almost exclusively to an ethos of reuse.

In one of the world's smallest countries, a royal's personal winery is open to the public.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

100 year tradition of fist fights, marked by marble footsteps.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The only museum with its curator—and her pets—buried inside.

A new sculpture calls attention to climate change in the centuries-old city it threatens.