The commemorative stone column conceals a secret laboratory.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The bronze uniforms commemorate the vital role of women during World War II.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

London's smallest police station is barely the size of a phone booth.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Try not to get slimed in Tribeca.

Enormous lake at the bottom of a unique cave system.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

A Roman temple perched over an Italian town, forgotten several times over.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The oldest operating pharmacy in the world features 800-year-old recipes.

Drink wine handed out through a window as part of an age-old tradition.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.