A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A contemporary fresco movement illustrates the region's rich history.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

An architectural oddity hides in plain sight on this iconic London bridge.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A cluttered and astounding collection of antiquities and curiosities.

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

Seat of the Duke and Duchess of Devonshire for centuries.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The shape of this old salt factory complex was inspired by the course of the Sun.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.