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."

This 11th century tower is said to be the oldest building in Oxford.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Giant marble phalluses on the sacred island of antiquity.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.