Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A quiet memorial to those who died saving others in the heart of the City of London.

A roadside shrine to a late rock god only remains thanks to the unyielding efforts of his fans.

The Pope’s secret escape route.

Breathtaking and huge 430 year old maps of Italy.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

One of the oldest trees in Britain may have been witness to some of the country's formative moments.

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

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

Dictionary Johnson’s favorite feline.

Ship-sized kinetic sculptural fantasy.

Single runway interrupted by a busy road that cuts across its middle.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Macabre astrological automaton clock dating to the late 1400s.

Looming communist pillar with a Czech twist.

Romania's triumphal arch looks out over Bucharest.

The largest greenhouse in the world is home to over one million types of plants.

This bridge was constructed from the rubble of the infamous Bastille.

A fantastic castle rumored to be the birthplace of King Arthur.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.