The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

Hear the tales of New York's most notorious criminals.

Visit the monolithic tomb of America's most famous general.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

Where Venice's gondolas go for a tune-up.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

A Milanese café entirely designed by the American director Wes Anderson.

Vast network of air raid tunnels beneath Lombardy's capital.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.