The place where World War I began.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

The first mosque in the world to receive electricity.

Oriental bazaar in the heart of Sarajevo.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Rebuilt remains of a temple to Roman god Mithras.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

This Underground station has been a popular filming location for decades, even before it closed.

The bronze uniforms commemorate the vital role of women during World War II.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

An unusual round church in London with a Templar past.

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

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

A pair of gigantic baby heads greet passengers at Atocha Station.