A tongue-in-cheek arcade where the games are based on everyday life.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Hear the quietest sound from across the dome.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

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

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

The oldest and smallest cemetery in Paris is only open to the public twice a year.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This banal Parisian entranceway is not what it seems.