Abandoned railway line circling the city of Paris.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A 4,000-year-old burial site hides behind a roadside Burger King.

This crumbling 14th century chapel became so unstable the roofing apparently collapsed during a wedding ceremony, narrowly missing the curate's head.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

Historical etchings such as “Miserable, wild, distracted 1350" and “The Archdeacon is an ass.”

An oasis of calm, nestled in the English countryside.

This 15th-century fortification was built to defend bunnies.

The wreckage of an old coastal trading vessel is only visible at low tide.

A mysterious crater-like pond has a spooky tendency to empty and fill with complete disregard to rainfall patterns.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

This remarkably intact, 260-year-old cargo ship is only visible at the lowest of spring tides.

In an isolated field near a dilapidated barn stands this chilling portrayal of the plight of the Nuba peoples of Sudan.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

This hidden natural fountain issues forth a steady supply of supposedly healing water that tastes like rotten eggs.

The UK's oldest theme park slowly slips away.

This abandoned oil depot produces world's longest echo in a manmade structure.

The photographs of "fairies" that fooled much of the world (including the creator of Sherlock Homes) were taken at this English stream.

The legend says that this English rock formation was once a hunter who was turned to stone by annoyed witches.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

This massive chalk hill carving is one of England's most beloved giant horse geoglyphs.

The intended purpose of this unfinished Elizabethan building remains a mystery.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.