Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The narrowest street in Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The celebrated eyesore created by starry-eyed sweethearts.

This small, ingenious cannon once helped regulate Parisian life.

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.

Paris' linguistic guide to the international language of, yes, love.

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

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

This bridge was constructed from the rubble of the infamous Bastille.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

What looks like a normal building is really a hollow facade hiding a subway vent.

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

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Heralded as the oldest statue in London.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

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