This legendary dessert was served to Nobel laureates for decades.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

On the wall of this medieval square, a symbol of the Spanish Inquisition.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Turntable anonymously received orphans, alms, and groceries.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

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

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

A wunderkammer of exoticism immortalized by Tom Waits.

Model Trains and Much More in Hamburg.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

Remnants of an exploded schooner and wrecked submarines form a breakwater.