The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The world's oldest bookshop still in operation.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

One man's remarkable private collection of art from around the world.

This charming candle shop has been in business since 1789.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Indents in the pavement are all that remain from a grisly death machine in Paris.

Small museum dedicated to one of the founding fathers of modern astronautics.

The most magnificent bottle house in a town strangely full of them.

Odd outsider art installations surround a Gold Rush-era ghost town.

What looks like a normal building is really a hollow facade hiding a subway vent.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

Abandoned railway line circling the city of Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.