This unattributed sculpture in Amsterdam is hiding in plain sight.

This cheese shop also houses a museum devoted to Dutch dairy.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

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

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

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

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

Art school in the Amazon: Drugs, nature and sustainable agriculture.

A scalable map of Colombia with the bonus of a butterfly house.

A magical world of elves and fairies tucked amongst the trees in Colombia.

Erected in 1803, it is the first astronomical observatory that was built in the Americas.

Known as the site of 'El Dorado,' this mysterious lake is rumored to hold gold beneath its waters.

A poignant mural honors the heroic teenage non-conformists who took on the Nazis and paid the ultimate price.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Berlin's old airport.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

A slice of central Asia in the middle of Berlin.

A surreal museum of extraordinary industrial objects.