Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Soldiers carved these regimental badges into the chalk hills in remembrance of those who died in World War I.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

Behemoth, cannon-like telescope operated by generations of Irish earls.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

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.

The burial place of 14 of the executed leaders of the Easter Rising.

A gated cross stands on the site where an Irish revolutionary met his end.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A historic observatory precariously perched at the "Top of Europe."