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

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

A beautiful geyser under environmental threat.

Home to items never before seen by the public.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Its buzzing collection honors vibrator history.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

This one has sailed five times as far as Sir Francis Drake's famous ship.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

This early version of the guillotine was used to execute the man responsible for its construction.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.