An archive of ceramic eggs painted to record clowns' personal makeup designs.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

The canine-themed book collection claims to be Europe's largest dog library.

The grounds of this Jacobean estate contain one of the oldest mulberry trees in England.

The world's oldest optical museum is an odd collection where the exhibits look at you.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

Three small rooms at the back of the “official” church of London's clowns.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

London's largest outsider art museum.

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

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This hidden green space is the city's second largest conservatory.

Collection dedicated to brands, packaging and advertising.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

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

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

One of the world's largest collections of pathological specimens.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

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

The remains of Crystal Palace Great Exhibition of 1851.

A cluttered and astounding collection of antiquities and curiosities.

The final resting place to 300 Victorian-era pets hides inside the city park.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.