Places mergrau Wants to Go

This unattributed sculpture in Amsterdam is hiding in plain sight.

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

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

A beautifully eclectic mix of architectural styles.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

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

Cat art as far as the eye can see.

Museum preserving torture methods from the past.

A floating cat sanctuary on an Amsterdam canal.

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

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

See massive fossils that are over 200 million years old in northeastern Arizona.

The trials and tribulations of marking Poe’s grave.

A museum dedicated to the alleged Roswell Incident.

A whimsical village of unique treehouses resides in a Washington forest.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

All that's left of the quintessential "cabin in the woods."

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.