A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

A speakeasy takes on Chicago's drinking culture.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This shop for all your super spy needs hides an educational secret.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

These morbid carvings remind churchgoers of the inevitability of death.

It's a mystery why these remains were found with no traces of their bodies in sight.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

A relic from one of London's worst 19th-century slums.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A Roman spa buried deep beneath the City of London.

A plaque marks the underground site of one of London's "lost rivers."

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.