Hidden in the Netherlands

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

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

A plaque hidden in the law faculty at Leiden University honors the first scientist to make liquid helium.

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

A retail shop has preserved the 17th-century food cellar from the old building it now occupies.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

The remains of a medieval wall discovered in the basement of a jewelry store.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

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