The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

Brussels' favorite peeing boy has a sister.

An elliptical glass tower that is known as the world’s first two-sided building.

A museum dedicated to antique toys, collectibles, and nostalgia.

This historic fort spans more the 300 years.

An abandoned masterpiece of Soviet Brutalist architecture.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

An angel that hatched from an egg!

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

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

A miraculous three-handed portrait of a saint can be found inside this church.

Over time, this castle grew to encompass the entire island.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This cheese shop also houses a museum devoted to Dutch dairy.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.