One of the deadliest American air disasters is nearly forgotten in Brooklyn.

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

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

The only museum with its curator—and her pets—buried inside.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

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.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

The plague quarantine island home to the alleged "Vampire of Venice."

Go inside to really appreciate this 500-year-old technological masterpiece.

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

Venice's "Island of the Mad."

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.

100 year tradition of fist fights, marked by marble footsteps.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The oldest surviving mosque in the UAE has mysterious origins and unusual architecture.

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

Local legend says the remains of Father Christmas lie within the medieval grounds.

Architectureal fantasy quarter of Rome.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.