Numerical symbolism abound at East Asia's oldest observatory.

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

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

An artist's cute bronze subway sculptures belie his violent artistic past.

Elevated freight railway turned wildly successful urban park.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Try not to get slimed in Tribeca.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Dr Barnes' $25 billion private collection of art and arboretum.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.