The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

A set of outdoor stairs named in honor of a famous Austrian artist.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The topiary maze at the Habsburg hunting lodge.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The celebrated eyesore created by starry-eyed sweethearts.

The site where two doves fell in love.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

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

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

This demon atop the Notre-Dame de Paris looks utterly bored.

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

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.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

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