The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

One of the best-preserved medieval streets in Europe.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

A museum dedicated to secret surveillance.

This Ocean Drive crosswalk has been paved in rainbow colors to honor the LGBTQ+ community and the man who brought pastel to Miami Beach.

Sip a Negroni Sbagliato in the bar that invented it.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

The secret medieval communication system will whisk your words above the noise of the crowd.

A brutalist gem towering over the heart of Milan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This building features dozens of faces along its facade, although one is a bit chilling.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

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

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

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

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Pilgrimage site for star-crossed lovers.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Third time's a charm, or in this case, two testicles are.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.