Go deep down into the earth to experience the world of Welsh coal miners.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A subterranean playground in an abandoned slate mine.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

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

Medical history with an amazing, if frighting, collection of wax diseases on display.

A museum of magic with a Sadist past.

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.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

Over 4,700 miles of trees being planted to hold back the desert.

This deceptively salty lake looks like blushing pink lemonade.

Where monkeys run wild and the humans are caged.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

Crawling into this primordial cave may feel disconcertingly familiar.