The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

A unique market that brings together various goods and cultures.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Famously misunderstood wonder of the ancient world

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

The medieval woodcut-style artwork chronicles life in medieval London.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

A six-ton wedding present for the King of the Scots.

The most loyal of little dogs, or a Victorian era publicity stunt?

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.