This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Boats must transform into railroad cars to navigate this Polish canal.

A gigantic collection of teeny, tiny books.

The oldest public library in Ireland.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

A collection of abandoned typographic signs from Berlin and beyond.

Housing the groundbreaking maps and globes of Gerard Mercator.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

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

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

This collection of unique liquids allows visitors to wander the waters of Iceland's glaciers.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

This unusual building straddles two countries.

"All Mountains - All The Time."

While this is positively the smallest library in Canada, it aspires to be the smallest in the world.

An accidentally hidden library containing the ephemeral history of New York.

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

Children's literature inside, forest all around.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

France's national museum of scientific and industrial instruments.

This massive library holds what was once the largest book collection in the world.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.