An automaton perched above an classic clock and watch store

This lake sits on an estimated 4 million tons of salt.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

A neolithic tomb converted into a tiny chapel.

This crumbling Portuguese ruin overlooks the populace it once ruled.

One of the largest Roman settlements in Portugal.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

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

Experience what life was like in Ireland during the Viking and medieval ages.

A corkscrew-shaped barn in Ireland.

One of Ireland's most infamous prisons for rebels including men, women and children.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

The narrowest street in Paris.

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

A haunting collection of the vanished and disappearing natural world.

A museum of carnival attractions where you are invited to ride the rides.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.