This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Step back in time at this 19th-century kiosk.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A musical instrument played by the sea.

The hairpin turns in this mountain road take the shape of a letter—is it a coincidence or a symbol of love?

An ancient knight and a symbol of the city's freedom.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

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

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

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

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