Countless grotesque faces stare out from this eerie Prague art wall.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

Museum in a swimming pool where the water still flows.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

This statue honors the thousands of Allied avians that served and died for France during World War I.

Because sometimes you need to make a batch of frites even when the stores are all closed.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

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

Though they've since been renamed, these two streets hint at Dublin's darker days.

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

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

A standing relief of a Norman knight whose posture marks him as a Crusader.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

Huge standing stones mark a site of megalithic mystery.