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

One part local history, 99 parts gruesome haunted house.

A student driver's nightmare.

An unusual round church in London with a Templar past.

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

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

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Banksy gives themself artistic license with this piece of London street art.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Amsterdam's Red Light District leaves little to the imagination.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This unusual elevator doesn’t stop or slow down.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A curious collection dedicated to human and animal anatomy and pathology.