Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This massive library holds what was once the largest book collection in the world.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

A haunting collection of the vanished and disappearing natural world.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

Visit on a Sunday morning to see some killer tricks.

A celebrated bandstand at the center of what was once the worst slum in London.

A wellspring of creativity in an already artsy East London neighborhood.

London's most popular recording studio, located in the capital's East End, runs partly on solar power and has played host to some of the world's biggest acts.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Ship-sized kinetic sculptural fantasy.

An architectural oddity hides in plain sight on this iconic London bridge.

An unreal vintage shop that wears its dadaist influence on its zombie fish.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.