Dictionary Johnson’s favorite feline.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

One of the world's largest collections of pathological specimens.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

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

An incarceration museum on the spot of possibly the oldest prison in England.

The anatomical-pathological collection of a man who changed surgery.

The largest of London's subterranean rivers and once a mad, bad center of London life.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Hear the quietest sound from across the dome.

A rare permanent monument to the Scottish Travellers.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

A historic cave in Scotland once served as a hiding place for a famous Covenanter.

A bay of elaborate, historic toilets are held in high esteem at this Scottish dock.

These mysterious religious carvings were once thought to be thousands of years old but are actually the work of modern eccentric.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

A close look reveals that the Scottish monument is just slightly off-kilter.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

This Scottish burial tomb once held hundreds of ancient eagle bones.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

At high tide this strange footbridge appears to have no purpose whatsoever.