Try not to get slimed in Tribeca.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

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

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

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The curious underground history of keeping Paris clean.

A world-class collection of mechanical musical instruments and automata.

A terrific purveyor of natural history objects and curios.

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.

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

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

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

A faux European lane smack dab in downtown L.A.

Church and home-museum of a 1920s female revivalist preacher with a very sordid past.