Immortal combat in a Moscow museum.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

In the middle of a barren moorland, the remnants of a lost British Space Age stand like a 20th-century Stonehenge.

Rare remnants of the brick-domed ovens birthed in the Durham coalfield during the Industrial Revolution.

A section of a historic wooden trestle viaduct is preserved next to the railway line it once carried.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Hidden beneath the streets of London is a secret subway that only carried mail.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

An iconic waterwheel in the Pennine Hills marks the location of one of Britain’s most profitable lead mines.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

A spectacular disused railway viaduct in a beautiful countryside nature reserve.

This spectacular bridge is part of an abandoned train line that once connected Mallorcan capital to the southeastern coast.

The two abandoned overpasses are among the largest bridges in Poland.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

The abandoned railway bridge stands hidden in the farmland of rural Cumbria.

These hellish-looking cliffs in the Canadian Arctic have been burning for centuries.