One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

This iconic Peak District ridge was once one of the busiest roads in medieval Britain.

This petite cutlery factory sits on the foundations of a defunct gasworks.

Eyam took steps to quarantine themselves and keep the plague from spreading.

A seaside town with no sea in sight.

The world's first successful water-powered cotton mill paved the way for the factories of the British Industrial Revolution.

This historic textile mill has been repurposed as a shopping outlet, which houses a textile museum that celebrates its industrial past.

This industrial gem was one of the earliest examples of a metal-framed building.

The longest stone bridge in England has an impressive history that dates back over 700 years.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

This early 19th-century blast furnace only survived because it was a financial and technical failure.

A long-overdue monument to the forgotten British men drafted into the coal mines during World War II.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Monasteries on rock pillars, once accessible only by frayed ropes.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

An architectural relic that survived the hands of time.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.