This Georgian architectural masterpiece is the only cloth hall left in Britain.

Aliens and monsters lurk inside this museum dedicated to one man's lifelong adoration of all things sci-fi.

A winding medieval path was used by mourners to carry their dead to the nearest church.

A modern English garden of eccentric beasts, follies, and oddities.

A calico cat named Tama was the wildly popular Super Station Master at this train stop in southeast Japan.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

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

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A network of concealed passageways lies within a busy London Underground station.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Hidden beneath the streets of London is a secret subway that only carried mail.

This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

The world's largest collection of witchcraft regalia.

A 200-year-old prison that now houses a peculiar crime museum.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

This Cheshire museum has cuckoo clocks, a rare pipe organ and vintage motorbikes. But mostly cuckoo clocks.

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

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

A forgotten "city of water" underneath the famous Trevi district.

A hospital where antique dolls are given new life.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.