The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Amsterdam's former hotspot for public executions and dissections.

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

A unique collection of gilded age mechanical pianos.

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

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

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

This unattributed sculpture in Amsterdam is hiding in plain sight.

A beautifully eclectic mix of architectural styles.

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

The history and future of cannabis.

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

Museum preserving torture methods from the past.

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

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Cat art as far as the eye can see.

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

The world's only museum devoted to the wonders of fluorescence.

Scotland's oldest purpose-built concert hall houses an incredible collection of ornate, centuries-old keyboards.

Nestled among the living residents is the final resting place of an apothecary plague victim.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

This stack of stones honors a murdered 18th-century woman.