Scattered throughout London are ancient remnants of the city's former bounding wall.

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

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

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

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

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Sail in for a ’dam good slice.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A floating cat sanctuary on an Amsterdam canal.

Museum preserving torture methods from the past.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A mocking tribute to the past and modern leadership of Prague.

This doorless 20th-century elevator doesn't stop or slow down.