400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

This windmill was used for well over a century.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

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

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The video game-themed street art first popped up in the French city.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

An Irish peat mine has become a stunning sculpture park.

The symbolic center of Ireland, this summit also offers panoramic views of the countryside.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Once home to a local bear named "Bruno."

Dedicated to preserving railway history from across Ireland.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The man who voiced Bugs Bunny, Daffy Duck, Porky Pig, and more has a headstone reading, "That's all, folks!"

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

How did a French journalist’s grave become the sexiest statue in the cemetery?

A remarkable feat of Victorian engineering across the Firth of Forth.

This mundane post marks the old location of the city's main postal hub.

This Birnam-based garden honors the legacy of 19th-century children’s book author Beatrix Potter.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

This tower once belonged to a castle fit for a knight.

These huge glacial erratics are humorously named after a much much smaller bird.

This former World War II torpedo testing location is now an important nesting site for migratory birds.