Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A 30-acre garden inspired by the principles of modern physics.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

Famously misunderstood wonder of the ancient world

Ancient ruins hidden underneath a modern luxury hotel.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Roman-era ships unearthed...

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

Rome's ancient Etruscan rival, now a park full of ruins.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This delightful little museum is dedicated to only one thing: pasta.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A pyramid in Central Europe of unknown origin.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.