According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Carved fountains poignantly placed in parks and in front of special monuments.

Fantastic views and thousands of love locks.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A thought-provoking outdoor art installation sits in the seat of German law.

These elaborate gothic monuments honor Verona's medieval lords.

This medieval castle was reconstructed by Carlo Scarpa.

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

Preserving the research tools, unexpected inventions, and odd collections of generations of college professors.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

The oldest church in Mantua was buried for centuries under the facades of other structures.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

Canada's largest dinosaur skeleton was hidden away in storage for more than 40 years.

A brutalist gem towering over the heart of Milan.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A Milanese café entirely designed by the American director Wes Anderson.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."