A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

"Purveyors of traditional sweets and vintage treats."

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

London's first edible insect farm offers facility tours and cooking classes.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

A naturally mummified 2,000-year-old man.

Abstract dinosaur models in London.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

This 1920s Dutch barge is now a floating bookstore.

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.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Catacombs turned marketplace.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Rebuilt remains of a temple to Roman god Mithras.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

Unchanged for centuries, this medieval library keeps its books in chains.

A true Valhalla for cactus and succulent lovers.

A market built atop boats is one of the few floating holiday markets in Europe.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This basement museum explores the art and artistry of fascism.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.