Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

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

This historic, palatial theater is now one of the world’s most beautiful bookstores.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

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

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

A tower devoted to — and modeled after — the Divine Comedy.

The narrowest house in Buenos Aires is less than 10 feet wide.

The curios of pharmacist and collector Henry Wellcome.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

This historic abandoned train station looks like a stop for ghost trains.

The largest public library in the United Kingdom was designed to reflect the industrial and artistic history of the city where it stands.

A bench and a bridge pay tribute to Birmingham's favorite heavy metal band.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This 19th-century Turkish bath house survived the Blitz of London and is now an events venue.

Artists and musicians now rule over this former rail station.

The cedar tree in Highgate Cemetery earned its title by accident.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This secluded walkway overlooks a magnificently wild London green space.