The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

Murals of the wild parties once held on the frozen River Thames.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This South London cemetery holds the remains of more than 15,000 people.

The cedar tree in Highgate Cemetery earned its title by accident.

A famous burial ground with a history both grim and literary.

The taxidermied remains of a once-great parrot.

The television series' iconic giant foot was borrowed from this classical painting.

The anatomical-pathological collection of a man who changed surgery.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

The curios of pharmacist and collector Henry Wellcome.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

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

A floating cat sanctuary on an Amsterdam canal.

The history and future of cannabis.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Recently restored menagerie of Victorian-era beasts.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This bridge was constructed from the rubble of the infamous Bastille.