A forgotten "city of water" underneath the famous Trevi district.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

The preserved left hand of a saint once known as "the Pearl of York."

A Reformation-era fiery figurehead once denoted this location as a print shop.

The final resting place of England's most notorious bandit.

An incredibly well-preserved piece of ninth-century Viking poop.

The little-known second castle that William the Conqueror built in York.

One of the shortest streets in York has an especially odd name.

This network of narrow, medieval passages has the most delightful name.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

This wooden chair dates possibly back to the 15th century, and commemorates a local legend.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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 community on a small Venetian island has taken to painting their houses in bright neon hues.

These engineering masterpieces are a dominant feature of the Belfast skyline.

It was once nicknamed "the most bombed hotel in Europe."

Celebrated in poem, this tiny hidden cemetery has a big and grisly history.