The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

This Parisian gem is one of the most incredible ethnographic museums in the world.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

The curious underground history of keeping Paris clean.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's national museum of scientific and industrial instruments.

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

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

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The cuisine at this Sheepshead Bay spot tells the story of a displaced Muslim Chinese community.

This slender three-story building has also had several famous residents.

New York City's only radical feminist independent bookstore.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

The oldest Dutch colonial stone house in New York City is a hidden gem on the border of Brooklyn and Queens.

The first piece of public art dedicated to LGBT rights.

Risk arrest while partying to fund art.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The most confusing clock in New York.

There must be a pun in this haystack somewhere...