One of three sites in England that house the National Collection of Arms and Armour.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

The second smallest castle keep in England.

One of the highest Roman forts in Britain is set amid dramatic scenery on a notoriously difficult road.

After mysteriously refusing to surrender at the end of World War II this sunken submarine was only salvaged in a search for Nazi gold.

This strategically placed hill fort has served defensive forces from the Iron Age up until the 20th century.

These precariously placed ruins harken back to a 13th-century castle.

This 700-year-old storehouse was a POW jail, aviation workshop, and Titanic memorial before becoming a brewpub.

A 13th-century fortified manor house that was once sieged during the English Civil War.

This tower once belonged to a castle fit for a knight.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

This ancient fort overlooks the site of a disastrous retreat from the English Civil War.

This Iron Age hill fort remained hidden until a series of storms revealed its history.

An Iron Age hillfort rooted in Arthurian legend was made famous by musician Peter Gabriel.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

A former fortified tower now houses a collection of classic communications equipment.

A unique military outpost carved into a rocky outcrop in the English Channel.

A fortified city, home to a remaining population of five families

This 19th-century island fort built to protect against an invasion by sea.

An unassuming historical marker for an iron age fort leads you to an oddly adorned cemetery for unbaptized children.

This ancient Irish landscape boasts hundreds of legendary ruins.