One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The fountain marks the area where hundreds of accused witches were burned at the stake.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

These fantastically named natural pools look like something out of a Scottish myth.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

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

An Anglo-Saxon cross inscribed with possibly the oldest written work of English literature.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A flooded Mexican cave that hides a river beneath the water.

This collection of ferns from across the globe is the largest assortment in the United States.

"If she'd leave us alone, we would have a happy home, sent from down below."

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Live long and prosper in Tennessee.

Mysterious library of an infamous financier and spiritual seeker.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.