This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

This delightful little museum is dedicated to only one thing: pasta.

Among the busts of heroes of the Roman Republic of 1849, there is also a statue of a boy and his dog.

A small cell adjacent to this church was once the bedroom for a renowned saint.

A burial vault located under Tiber Island in the middle of the Italian capital.

This is the oldest Roman-made bridge in the city still existing in its original state.

Rome's ancient Etruscan rival, now a park full of ruins.

Jesus' footprints and the first catacombs in the world.

Visit an imposing 13th-century Transylvanian citadel lurking not far from the region's more heavily touristed attractions.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

Once a meeting point for great thinkers, and the midpoint of the country.

Petting this mysterious iron monkey supposedly brings good luck.

Robot jockeys ride their humped mounts to victory as part of a 21st-century twist on an ancient desert sport.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

This annual Belgian water race attracts bathtub captains from all over the world.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

According to this bar, God gave an “11th commandment” to Antwerp: Thou shalt drink beer.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.