Plaques on its facade commemorate the Tiber's most destructive deluges.

A massive marble foot is tucked away in a small alley near the Pantheon.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

The middle finger of modernity.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

Drink wine handed out through a window as part of an age-old tradition.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

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

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

An island on the Venetian Lagoon hosts this stone chair that has nothing to do with the King of the Huns.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

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

This house's itty bitty size means no humans allowed.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Vibrant street art created with mixed media.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.