A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

Japanese company creates clone dolls that reside in the "uncanny valley."

Underground farm located in a former bank vault deep within the bowels of Tokyo's business district.

The "Little Ones," show Portugal in full miniature splendor.

A repository of Pasadena history.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

A plaque by the roadside describes a three-dimensional glossary of an imagined language where words are numbers and numbers are words.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

World's oldest and largest space launch facility, once a secret missile testing site.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

A grove of colossal man-made flowers built to collect the sun's rays.

A clock designed to run with perfect accuracy for 10,000 years.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

An enormous, inside-out glass globe built in 1935.

Bouncing, delightful, mechanical art at the MIT Museum.

A bizarre form of natural mummification was discovered in the church of this Frisian village.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.