World's strongest whirlpool.

Norway has built what may be the world's most beautiful public toilet.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

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

Protecting the dead from opportunistic body snatchers.

The location of a citizen uprising that led to a gruesome act of mob justice.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

A former telephone box found new life as a photo booth and charity fundraiser.

Bouncing, delightful, mechanical art at the MIT Museum.

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

Unknown to many, this is where items not displayed in a Dutch history of science museum are held.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

A plaque hidden in the law faculty at Leiden University honors the first scientist to make liquid helium.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

His "Lionheart" is entombed separately from the rest of his body.