This unattributed sculpture in Amsterdam is hiding in plain sight.

Museum preserving torture methods from the past.

Cat art as far as the eye can see.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

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

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

The largest flower auction house in the world.

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

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

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

The place where houses are born.

Dutch woodpile home in the forest.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

A grassy pyramid named after a French battle.

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

One woman's lifelong collection is on display in this unassuming house on an Icelandic fjord.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

Abandoned anti-ballistic missile base.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.