This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The Pope’s secret escape route.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The stunning interior of this Gothic church is covered in ornate gold details.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

Breathtaking and huge 430 year old maps of Italy.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

One of the oldest masonic museums in Paris.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

The room where Vincent van Gogh died.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This museum houses an imposing skeleton army comprised of creatures great and small.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

The atmospheric road was never meant to be so creepy.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This Polish cave has housed a dragon, a brothel, and an enduring legend.