Along the banks of the River Rhine lies a park that seems unassuming, but beneath the surface lies a long and fascinating history.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This unusual small wind turbine in Germany has only a single rotor blade.

This bomb was once used as a church after it failed to detonate.

The remains of three Luftwaffe launch pads designed for manned anti-aircraft missiles.

A thriving community of Taiwanese art.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

What once sat in the world’s spotlight is today a largely disused ghost complex.

This natural "sea of stones" was once used by the Romans as a quarry.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

Gods clash with machines in a power plant regenerated as a museum.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Ancient ruins hidden underneath a modern luxury hotel.

This statue is the only female representation of Rome's "talking statues."

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A forgotten "city of water" underneath the famous Trevi district.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

The Pope’s secret escape route.

A modern sliver of architecture in Roma.

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

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.