This monumental fountain has moved around the city multiple times.

The relics of dozens of martyrs are stored in a single chapel.

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

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Richard Luke Concanen never set foot on American soil.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Amsterdam's former hotspot for public executions and dissections.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The former headquarters of history's oldest megacorporation.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A beautifully eclectic mix of architectural styles.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

"Drunken ship" sculpture memorializing the French poet in the city where he died.

After immigrating to Paris in the 1970s, two brothers from Laos built a grocery store empire.

Peruse produce from Senegal, Cameroon, and other West African nations at this sprawling market.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.