A place to see how French aristocrats lived in the early 1900s.

A medieval military street hidden beneath a charming French fishing village.

This massive blockhead sculpture hides an entire library.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

The oldest licensed distillery in Ireland.

This micro-nation may be some sort of prank, but its constitution sure seems official.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

The best place in the world to buy tinned fish.

One of the smallest bookstores on the planet.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Home to items never before seen by the public.

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

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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

"There's nothing there," and other lies the KGB told us.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Budapest's Communist-era statues, banished to the suburbs.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.