The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

These mysterious mazes carved on the rock may be up to 4,000 years old.

A series of carved figures that scandalized British society.

Rebuilt remains of a temple to Roman god Mithras.

A faded reminder of what was once a common sight in London during the Blitz.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

A little slice of Japan and its aesthetics in London's Holland Park.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Murals of the wild parties once held on the frozen River Thames.

A hands-off space for graffiti artists to hone and display their skills.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Public access to clean drinking water was an instant hit among the masses.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

The Tudor-style cottage in the middle of the square is not quite what it seems.

From the dishes to the art, this Michelin-starred restaurant orbits around one beloved French melon.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The final resting place to 300 Victorian-era pets hides inside the city park.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.