The vast, legendary catacombs hold secrets much stranger than stacked bones.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

The oldest continuously operating mint in the world that has been making coins since the 9th-century.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This bridge was constructed from the rubble of the infamous Bastille.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The narrowest street in Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

One of Jeff Koons’s largest sculptures and his first commemorative work.

Travel back in time at a Moroccan-inspired restaurant that was the height of glamor in the 1970s.

Used as an example in one of the first dictionary entries for "museum" in 1706.

Legend says this public grazing area hasn't been plowed for thousands of years.

These ancient ruins were the final resting place of King Henry II's mistress.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This 1920s Dutch barge is now a floating bookstore.

An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

Hidden in plain sight, this creepy sculpture watches from above.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."